[issue13263] Group some os functions in submodules

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

I think there is a value to use the very same function names in the posix module as in the posix API. The posix API (and C in general) is also flat, and uses the prefix convention. People who look at the function lists will know to ignore blocks of functions by prefix if they don't need them.

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<http://bugs.python.org/issue13263>
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