[issue10395] new os.path function to extract common prefix based on path components

[Rafik Draoui]

Rafik Draoui added the comment:

Here is a new patch addressing some of storchaka review comments, and implementing a version in ntpath.

For the Windows version, I did as proposed in msg174819, but as I am not familiar with the semantics and subtleties of paths in Windows maybe this version of ntpath.commonpath is too simplistic and would return wrong results in some cases. I would like someone more knowledgeable in Windows to take care of it, or maybe just provide a test suite with lots of different corner cases that I could use to provide a better implementation.

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Added file: http://bugs.python.org/file27899/patch10395-2

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