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

[Santoso Wijaya]

Changes by Santoso Wijaya <santoso.wijaya at gmail.com>:


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nosy: +santa4nt
versions: +Python 3.3 -Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10395>
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