[issue5799] Change ntpath functions to implicitly support UNC paths

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

This looks okay to me. (The itertools import isn't needed, but easy
enough to fix on checkin.)

I'd still like someone else to look it over, but if no one does before
the beta, I'll check it in.

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keywords: +needs review
stage:  -> patch review

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<http://bugs.python.org/issue5799>
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