[issue1714] ConfigParser.py do not allow leading (and trailing) space in values.

[Quentin Gallet-Gilles]

Quentin Gallet-Gilles added the comment:

Attached patch contain the added behavior, some unit tests to validate
it and updated documentation.

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nosy: +quentin.gallet-gilles
Added file: http://bugs.python.org/file9217/cfgparser_doublequotes.patch

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