Fixes for PEP8 W2 whitespace warnings.
Fix PEP8 E711 and E712 (comparisons to True/False/None).
Fixes for PEP8 E241 and E242.
Fixes for PEP8 E3 issues (too few or too many blank lines).
PEP8 fixes for E271 (multiple spaces after keyword).
PEP8 fixes for E231 (missing whitespace after delimiters).
Fix PEP8 E713 issues (test for membership should be ‘not in’)
Fix PEP8 E703 (statement ends with a semicolon).
Fix PEP8 E714 issues (test for object identity should be ‘is not’).
Fix PEP8 E401 issues (multiple imports on one line).
Fix PEP8 W191 (indentation contains tabs).
Mention PEP8 work in NEWS
Fix colon spacing / PEP8 E203
Fix colon spacing in lambda / PEP8 E203
Indent comments the same as the code they belong to (PEP8 E112).
Fix PEP8 E111 (indentation is not a multiple of four).
Remove redundant backslashes within brackets (PEP8 E502).
Fixes for PEP8 E201 and E202 (whitespace before and after brackets).
Fixes for PEP8 E113 (unexpected indentation).
Fix PEP8 E3 issues (too few or too many blank lines).