BibSort: improved washers

* Improves speed and realiability of BibSort washers by properly
  exploiting textutils.decode_to_unicode() and
  textutils.translate_to_ascii() functions.

* Improves speed of textutils.translate_to_ascii().

* Makes unidecode dependency mandatory.

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
1: D100 Docstring missing
4: I102 copyright year is outdated, expected 2014 but got 2011
80: D103 Docstring missing
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173: D400 First line should end with '.', not 's'
173: D205 Blank line missing between one-line summary and description
173: D208 Docstring is over-indented
243:31: E111 indentation is not a multiple of four
243:31: E113 unexpected indentation
260:28: E111 indentation is not a multiple of four
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267:19: E126 continuation line over-indented for hanging indent
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329: D103 Docstring missing
333: D400 First line should end with '.', not 'N'
338: D400 First line should end with '.', not 's'
348: D400 First line should end with '.', not 's'
375: D400 First line should end with '.', not 's'
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392: D400 First line should end with '.', not 'r'
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469: D400 First line should end with '.', not 'R'
469: D205 Blank line missing between one-line summary and description
469: D208 Docstring is over-indented
492:25: E113 unexpected indentation
505:25: E127 continuation line over-indented for visual indent
505:39: E203 whitespace before ':'
523: D202 No blank lines allowed *after* function docstring, found 1
523: D400 First line should end with '.', not 's'
523: D205 Blank line missing between one-line summary and description
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538:24: E128 continuation line under-indented for visual indent
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542: D103 Docstring missing
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567: D400 First line should end with '.', not 'd'
567: D205 Blank line missing between one-line summary and description
567: D208 Docstring is over-indented
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677: D400 First line should end with '.', not 'd'
677: D205 Blank line missing between one-line summary and description
677: D208 Docstring is over-indented
710:31: E203 whitespace before ':'
721: D400 First line should end with '.', not 'n'
721: D205 Blank line missing between one-line summary and description
721: D208 Docstring is over-indented
749: D400 First line should end with '.', not 'e'
749: D205 Blank line missing between one-line summary and description
749: D208 Docstring is over-indented
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820:28: E127 continuation line over-indented for visual indent
832: D103 Docstring missing
845: D400 First line should end with '.', not 's'
845: D205 Blank line missing between one-line summary and description
845: D208 Docstring is over-indented
869: D400 First line should end with '.', not ','
869: D205 Blank line missing between one-line summary and description
869: D208 Docstring is over-indented
906:34: E203 whitespace before ':'
907:34: E203 whitespace before ':'
908:34: E203 whitespace before ':'
909:34: E203 whitespace before ':'
910:34: E203 whitespace before ':'
911:34: E203 whitespace before ':'
912:34: E203 whitespace before ':'
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914:34: E203 whitespace before ':'
960:17: E128 continuation line under-indented for visual indent
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992:21: E128 continuation line under-indented for visual indent
1007: D400 First line should end with '.', not 'y'
1007: D205 Blank line missing between one-line summary and description
1007: D208 Docstring is over-indented
1028: D400 First line should end with '.', not ','
1028: D205 Blank line missing between one-line summary and description
1028: D208 Docstring is over-indented
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1049: D103 Docstring missing
1059: D400 First line should end with '.', not 'n'
1059: D205 Blank line missing between one-line summary and description
1059: D208 Docstring is over-indented
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1136:35: E111 indentation is not a multiple of four
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1138:35: E111 indentation is not a multiple of four
1138:35: E113 unexpected indentation
1171: D400 First line should end with '.', not 'e'
1171: D205 Blank line missing between one-line summary and description
1171: D208 Docstring is over-indented
1198: D400 First line should end with '.', not 'e'
1198: D205 Blank line missing between one-line summary and description
1198: D208 Docstring is over-indented
1210:35: E111 indentation is not a multiple of four
1210:35: E113 unexpected indentation
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1212:35: E113 unexpected indentation
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1259: D103 Docstring missing
1261:24: E111 indentation is not a multiple of four
1261:24: E113 unexpected indentation
1271: D400 First line should end with '.', not 'e'
1271: D205 Blank line missing between one-line summary and description
1271: D208 Docstring is over-indented
1314:24: E221 multiple spaces before operator
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1348:39: E221 multiple spaces before operator
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1361:16: E126 continuation line over-indented for hanging indent
1384: D401 First line should be imperative: 'take', not 'takes'
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