make pep8 pass on mrmetadata.py with --max-line-length=256

Fixed 300+ errors and warnings:
```
mrmetadata.py:1:2: E111 indentation is not a multiple of four
mrmetadata.py:1:2: E113 unexpected indentation
mrmetadata.py:23:43: E201 whitespace after '('
mrmetadata.py:23:67: E202 whitespace before ')'
mrmetadata.py:25:35: E201 whitespace after '('
mrmetadata.py:25:58: E202 whitespace before ')'
mrmetadata.py:29:1: E265 block comment should start with '# '
mrmetadata.py:31:1: E265 block comment should start with '# '
mrmetadata.py:33:1: E302 expected 2 blank lines, found 1
mrmetadata.py:34:1: W293 blank line contains whitespace
mrmetadata.py:36:8: E111 indentation is not a multiple of four
mrmetadata.py:37:8: E111 indentation is not a multiple of four
mrmetadata.py:38:1: W293 blank line contains whitespace
mrmetadata.py:42:1: W293 blank line contains whitespace
mrmetadata.py:44:1: W293 blank line contains whitespace
mrmetadata.py:46:1: W293 blank line contains whitespace
mrmetadata.py:51:1: W293 blank line contains whitespace
mrmetadata.py:52:1: W293 blank line contains whitespace
mrmetadata.py:53:1: E265 block comment should start with '# '
mrmetadata.py:55:1: E265 block comment should start with '# '
mrmetadata.py:60:1: W293 blank line contains whitespace
mrmetadata.py:63:1: W293 blank line contains whitespace
mrmetadata.py:68:1: W293 blank line contains whitespace
mrmetadata.py:70:1: W293 blank line contains whitespace
mrmetadata.py:71:35: W603 '<>' is deprecated, use '!='
mrmetadata.py:75:43: W603 '<>' is deprecated, use '!='
mrmetadata.py:79:1: W293 blank line contains whitespace
mrmetadata.py:83:1: W293 blank line contains whitespace
mrmetadata.py:84:1: W293 blank line contains whitespace
mrmetadata.py:86:1: E303 too many blank lines (3)
mrmetadata.py:87:1: W293 blank line contains whitespace
mrmetadata.py:95:19: E201 whitespace after '{'
mrmetadata.py:104:1: W293 blank line contains whitespace
mrmetadata.py:106:1: W293 blank line contains whitespace
mrmetadata.py:109:35: E261 at least two spaces before inline comment
mrmetadata.py:112:1: W293 blank line contains whitespace
mrmetadata.py:123:1: W293 blank line contains whitespace
mrmetadata.py:137:1: W293 blank line contains whitespace
mrmetadata.py:142:13: E201 whitespace after '('
mrmetadata.py:142:37: E202 whitespace before ')'
mrmetadata.py:143:1: W293 blank line contains whitespace
mrmetadata.py:145:63: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:145:65: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:146:17: E265 block comment should start with '# '
mrmetadata.py:147:1: W293 blank line contains whitespace
mrmetadata.py:153:1: W293 blank line contains whitespace
mrmetadata.py:156:1: W293 blank line contains whitespace
mrmetadata.py:160:9: E303 too many blank lines (2)
mrmetadata.py:161:1: W293 blank line contains whitespace
mrmetadata.py:163:1: W293 blank line contains whitespace
mrmetadata.py:164:1: W293 blank line contains whitespace
mrmetadata.py:165:9: E303 too many blank lines (2)
mrmetadata.py:171:1: W293 blank line contains whitespace
mrmetadata.py:174:13: E112 expected an indented block
mrmetadata.py:176:154: E202 whitespace before ')'
mrmetadata.py:177:1: W293 blank line contains whitespace
mrmetadata.py:181:1: W293 blank line contains whitespace
mrmetadata.py:186:1: W293 blank line contains whitespace
mrmetadata.py:191:9: E303 too many blank lines (2)
mrmetadata.py:192:1: W293 blank line contains whitespace
mrmetadata.py:193:13: E201 whitespace after '('
mrmetadata.py:193:37: E202 whitespace before ')'
mrmetadata.py:198:1: W293 blank line contains whitespace
mrmetadata.py:209:130: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:209:132: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:209:137: E202 whitespace before ')'
mrmetadata.py:212:5: E303 too many blank lines (2)
mrmetadata.py:212:38: E703 statement ends with a semicolon
mrmetadata.py:222:1: W293 blank line contains whitespace
mrmetadata.py:224:43: E201 whitespace after '('
mrmetadata.py:224:51: E201 whitespace after '('
mrmetadata.py:224:104: W291 trailing whitespace
mrmetadata.py:225:41: E128 continuation line under-indented for visual indent
mrmetadata.py:225:73: E202 whitespace before ')'
mrmetadata.py:228:1: W293 blank line contains whitespace
mrmetadata.py:231:20: E201 whitespace after '('
mrmetadata.py:231:56: E202 whitespace before ')'
mrmetadata.py:232:1: W293 blank line contains whitespace
mrmetadata.py:234:1: W293 blank line contains whitespace
mrmetadata.py:241:136: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:241:138: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:241:167: E202 whitespace before ')'
mrmetadata.py:243:1: W293 blank line contains whitespace
mrmetadata.py:244:5: E303 too many blank lines (2)
mrmetadata.py:248:1: W293 blank line contains whitespace
mrmetadata.py:250:1: W293 blank line contains whitespace
mrmetadata.py:251:19: E225 missing whitespace around operator
mrmetadata.py:253:1: W293 blank line contains whitespace
mrmetadata.py:255:1: W293 blank line contains whitespace
mrmetadata.py:257:1: W293 blank line contains whitespace
mrmetadata.py:259:1: W293 blank line contains whitespace
mrmetadata.py:261:1: W293 blank line contains whitespace
mrmetadata.py:263:1: W293 blank line contains whitespace
mrmetadata.py:265:1: W293 blank line contains whitespace
mrmetadata.py:267:1: W293 blank line contains whitespace
mrmetadata.py:269:1: W293 blank line contains whitespace
mrmetadata.py:270:33: E703 statement ends with a semicolon
mrmetadata.py:271:1: W293 blank line contains whitespace
mrmetadata.py:276:1: W293 blank line contains whitespace
mrmetadata.py:279:1: W293 blank line contains whitespace
mrmetadata.py:281:1: W293 blank line contains whitespace
mrmetadata.py:286:1: E303 too many blank lines (3)
mrmetadata.py:289:1: W293 blank line contains whitespace
mrmetadata.py:290:38: E261 at least two spaces before inline comment
mrmetadata.py:291:1: W293 blank line contains whitespace
mrmetadata.py:293:1: W293 blank line contains whitespace
mrmetadata.py:295:1: W293 blank line contains whitespace
mrmetadata.py:296:36: E703 statement ends with a semicolon
mrmetadata.py:297:1: W293 blank line contains whitespace
mrmetadata.py:302:1: E303 too many blank lines (3)
mrmetadata.py:306:5: E265 block comment should start with '# '
mrmetadata.py:307:1: W293 blank line contains whitespace
mrmetadata.py:310:41: E703 statement ends with a semicolon
mrmetadata.py:311:1: W293 blank line contains whitespace
mrmetadata.py:312:19: E225 missing whitespace around operator
mrmetadata.py:316:1: W293 blank line contains whitespace
mrmetadata.py:317:5: E265 block comment should start with '# '
mrmetadata.py:323:1: E303 too many blank lines (3)
mrmetadata.py:324:1: W293 blank line contains whitespace
mrmetadata.py:327:5: E265 block comment should start with '# '
mrmetadata.py:331:1: W293 blank line contains whitespace
mrmetadata.py:334:1: W293 blank line contains whitespace
mrmetadata.py:338:33: E128 continuation line under-indented for visual indent
mrmetadata.py:339:33: E128 continuation line under-indented for visual indent
mrmetadata.py:340:33: E128 continuation line under-indented for visual indent
mrmetadata.py:341:1: W293 blank line contains whitespace
mrmetadata.py:343:1: W293 blank line contains whitespace
mrmetadata.py:347:1: W293 blank line contains whitespace
mrmetadata.py:348:23: W603 '<>' is deprecated, use '!='
mrmetadata.py:353:1: W293 blank line contains whitespace
mrmetadata.py:356:17: E265 block comment should start with '# '
mrmetadata.py:357:1: W293 blank line contains whitespace
mrmetadata.py:372:1: W293 blank line contains whitespace
mrmetadata.py:377:1: W293 blank line contains whitespace
mrmetadata.py:382:1: W293 blank line contains whitespace
mrmetadata.py:383:21: E201 whitespace after '('
mrmetadata.py:385:21: E265 block comment should start with '# '
mrmetadata.py:386:17: E265 block comment should start with '# '
mrmetadata.py:388:1: W293 blank line contains whitespace
mrmetadata.py:389:29: E261 at least two spaces before inline comment
mrmetadata.py:389:30: E262 inline comment should start with '# '
mrmetadata.py:390:17: E265 block comment should start with '# '
mrmetadata.py:392:1: W293 blank line contains whitespace
mrmetadata.py:393:42: E703 statement ends with a semicolon
mrmetadata.py:394:5: E265 block comment should start with '# '
mrmetadata.py:396:34: W291 trailing whitespace
mrmetadata.py:400:1: E265 block comment should start with '# '
mrmetadata.py:400:1: E303 too many blank lines (3)
mrmetadata.py:402:1: E265 block comment should start with '# '
mrmetadata.py:404:1: E302 expected 2 blank lines, found 3
mrmetadata.py:404:20: E201 whitespace after '('
mrmetadata.py:404:56: E202 whitespace before ')'
mrmetadata.py:406:5: E265 block comment should start with '# '
mrmetadata.py:408:5: E265 block comment should start with '# '
mrmetadata.py:409:1: W293 blank line contains whitespace
mrmetadata.py:412:1: W293 blank line contains whitespace
mrmetadata.py:421:5: E303 too many blank lines (2)
mrmetadata.py:422:1: W293 blank line contains whitespace
mrmetadata.py:426:27: E201 whitespace after '{'
mrmetadata.py:431:5: E303 too many blank lines (2)
mrmetadata.py:432:1: W293 blank line contains whitespace
mrmetadata.py:433:1: W293 blank line contains whitespace
mrmetadata.py:434:5: E303 too many blank lines (2)
mrmetadata.py:437:25: E201 whitespace after '{'
mrmetadata.py:440:24: E124 closing bracket does not match visual indentation
mrmetadata.py:441:1: W293 blank line contains whitespace
mrmetadata.py:445:25: E201 whitespace after '{'
mrmetadata.py:448:24: E124 closing bracket does not match visual indentation
mrmetadata.py:449:1: W293 blank line contains whitespace
mrmetadata.py:450:1: W293 blank line contains whitespace
mrmetadata.py:451:1: W293 blank line contains whitespace
mrmetadata.py:452:5: E303 too many blank lines (3)
mrmetadata.py:453:1: W293 blank line contains whitespace
mrmetadata.py:455:1: W293 blank line contains whitespace
mrmetadata.py:457:1: W293 blank line contains whitespace
mrmetadata.py:459:40: E222 multiple spaces after operator
mrmetadata.py:459:53: E201 whitespace after '('
mrmetadata.py:459:142: E202 whitespace before ')'
mrmetadata.py:462:1: W293 blank line contains whitespace
mrmetadata.py:464:1: W293 blank line contains whitespace
mrmetadata.py:466:1: W293 blank line contains whitespace
mrmetadata.py:468:1: W293 blank line contains whitespace
mrmetadata.py:470:1: W293 blank line contains whitespace
mrmetadata.py:471:36: E222 multiple spaces after operator
mrmetadata.py:471:49: E201 whitespace after '('
mrmetadata.py:471:138: E202 whitespace before ')'
mrmetadata.py:472:1: W293 blank line contains whitespace
mrmetadata.py:474:1: W293 blank line contains whitespace
mrmetadata.py:476:1: W293 blank line contains whitespace
mrmetadata.py:482:32: E201 whitespace after '{'
mrmetadata.py:482:51: E202 whitespace before '}'
mrmetadata.py:483:1: W293 blank line contains whitespace
mrmetadata.py:488:1: W293 blank line contains whitespace
mrmetadata.py:490:1: W293 blank line contains whitespace
mrmetadata.py:491:54: E231 missing whitespace after ','
mrmetadata.py:491:63: E231 missing whitespace after ','
mrmetadata.py:491:78: E231 missing whitespace after ','
mrmetadata.py:492:1: W293 blank line contains whitespace
mrmetadata.py:497:5: E303 too many blank lines (2)
mrmetadata.py:498:1: W293 blank line contains whitespace
mrmetadata.py:502:1: W293 blank line contains whitespace
mrmetadata.py:507:1: W293 blank line contains whitespace
mrmetadata.py:521:1: W293 blank line contains whitespace
mrmetadata.py:522:76: E231 missing whitespace after ','
mrmetadata.py:522:85: E231 missing whitespace after ','
mrmetadata.py:522:100: E231 missing whitespace after ','
mrmetadata.py:523:1: W293 blank line contains whitespace
mrmetadata.py:528:1: W293 blank line contains whitespace
mrmetadata.py:529:1: E265 block comment should start with '# '
mrmetadata.py:529:1: E303 too many blank lines (3)
mrmetadata.py:531:1: E265 block comment should start with '# '
mrmetadata.py:533:1: E302 expected 2 blank lines, found 3
mrmetadata.py:534:1: W293 blank line contains whitespace
mrmetadata.py:538:1: W293 blank line contains whitespace
mrmetadata.py:543:1: E303 too many blank lines (3)
mrmetadata.py:544:1: W293 blank line contains whitespace
mrmetadata.py:546:1: W293 blank line contains whitespace
mrmetadata.py:547:76: W291 trailing whitespace
mrmetadata.py:548:58: E231 missing whitespace after ','
mrmetadata.py:548:67: E231 missing whitespace after ','
mrmetadata.py:548:82: E231 missing whitespace after ','
mrmetadata.py:552:1: E265 block comment should start with '# '
mrmetadata.py:554:1: E265 block comment should start with '# '
mrmetadata.py:557:1: W293 blank line contains whitespace
mrmetadata.py:562:40: W291 trailing whitespace
mrmetadata.py:568:1: E302 expected 2 blank lines, found 1
mrmetadata.py:569:1: W293 blank line contains whitespace
mrmetadata.py:574:40: W291 trailing whitespace
mrmetadata.py:582:1: W293 blank line contains whitespace
mrmetadata.py:585:1: W293 blank line contains whitespace
mrmetadata.py:587:1: W293 blank line contains whitespace
mrmetadata.py:598:1: W293 blank line contains whitespace
mrmetadata.py:604:1: E265 block comment should start with '# '
mrmetadata.py:606:1: E265 block comment should start with '# '
mrmetadata.py:610:1: W293 blank line contains whitespace
mrmetadata.py:611:42: E201 whitespace after '('
mrmetadata.py:611:54: E202 whitespace before ')'
mrmetadata.py:612:1: W293 blank line contains whitespace
mrmetadata.py:623:1: W293 blank line contains whitespace
mrmetadata.py:627:129: W291 trailing whitespace
mrmetadata.py:628:1: W293 blank line contains whitespace
mrmetadata.py:629:24: E201 whitespace after '{'
mrmetadata.py:633:35: E201 whitespace after '('
mrmetadata.py:633:51: E202 whitespace before ')'
mrmetadata.py:643:1: E303 too many blank lines (3)
mrmetadata.py:643:17: E211 whitespace before '('
mrmetadata.py:643:19: E201 whitespace after '('
mrmetadata.py:643:48: E202 whitespace before ')'
mrmetadata.py:654:37: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:654:39: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:654:59: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:654:61: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:654:76: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:654:78: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:658:13: E128 continuation line under-indented for visual indent
mrmetadata.py:659:13: E128 continuation line under-indented for visual indent
mrmetadata.py:660:13: E128 continuation line under-indented for visual indent
mrmetadata.py:661:13: E128 continuation line under-indented for visual indent
mrmetadata.py:662:13: E128 continuation line under-indented for visual indent
mrmetadata.py:663:13: E128 continuation line under-indented for visual indent
mrmetadata.py:664:13: E128 continuation line under-indented for visual indent
mrmetadata.py:665:1: W293 blank line contains whitespace
mrmetadata.py:671:112: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:671:114: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:672:1: W293 blank line contains whitespace
mrmetadata.py:675:42: E201 whitespace after '('
mrmetadata.py:675:59: E202 whitespace before ')'
mrmetadata.py:677:43: E211 whitespace before '('
mrmetadata.py:677:45: E201 whitespace after '('
mrmetadata.py:678:1: W293 blank line contains whitespace
mrmetadata.py:679:14: E201 whitespace after '{'
mrmetadata.py:683:13: E124 closing bracket does not match visual indentation
mrmetadata.py:684:1: W293 blank line contains whitespace
mrmetadata.py:685:24: E201 whitespace after '{'
mrmetadata.py:685:31: E203 whitespace before ':'
mrmetadata.py:686:21: E128 continuation line under-indented for visual indent
mrmetadata.py:687:21: E128 continuation line under-indented for visual indent
mrmetadata.py:688:21: E128 continuation line under-indented for visual indent
mrmetadata.py:688:46: E203 whitespace before ':'
mrmetadata.py:689:21: E128 continuation line under-indented for visual indent
mrmetadata.py:689:37: E203 whitespace before ':'
mrmetadata.py:691:35: E201 whitespace after '('
mrmetadata.py:691:51: E202 whitespace before ')'
mrmetadata.py:700:109: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:700:111: E251 unexpected spaces around keyword / parameter equals
mrmetadata.py:702:42: E201 whitespace after '('
mrmetadata.py:702:59: E202 whitespace before ')'
mrmetadata.py:704:43: E211 whitespace before '('
mrmetadata.py:704:45: E201 whitespace after '('
mrmetadata.py:705:1: W293 blank line contains whitespace
mrmetadata.py:706:14: E201 whitespace after '{'
mrmetadata.py:710:13: E124 closing bracket does not match visual indentation
mrmetadata.py:712:24: E201 whitespace after '{'
mrmetadata.py:712:31: E203 whitespace before ':'
mrmetadata.py:713:21: E128 continuation line under-indented for visual indent
mrmetadata.py:714:21: E128 continuation line under-indented for visual indent
mrmetadata.py:715:21: E128 continuation line under-indented for visual indent
mrmetadata.py:715:46: E203 whitespace before ':'
mrmetadata.py:716:21: E128 continuation line under-indented for visual indent
mrmetadata.py:717:21: E128 continuation line under-indented for visual indent
mrmetadata.py:717:37: E203 whitespace before ':'
mrmetadata.py:719:35: E201 whitespace after '('
mrmetadata.py:719:51: E202 whitespace before ')'
mrmetadata.py:729:1: E303 too many blank lines (3)
mrmetadata.py:729:18: E211 whitespace before '('
mrmetadata.py:729:20: E201 whitespace after '('
mrmetadata.py:729:27: E202 whitespace before ')'
mrmetadata.py:730:30: E201 whitespace after '('
mrmetadata.py:730:37: E202 whitespace before ')'
mrmetadata.py:736:1: E265 block comment should start with '# '
mrmetadata.py:739:1: W293 blank line contains whitespace
mrmetadata.py:741:1: W293 blank line contains whitespace
mrmetadata.py:743:1: W293 blank line contains whitespace
mrmetadata.py:745:1: W293 blank line contains whitespace
mrmetadata.py:747:1: W293 blank line contains whitespace
mrmetadata.py:749:1: W293 blank line contains whitespace
mrmetadata.py:751:1: W293 blank line contains whitespace
mrmetadata.py:753:1: W293 blank line contains whitespace
mrmetadata.py:756:1: W293 blank line contains whitespace
mrmetadata.py:758:27: W292 no newline at end of file
```