[issue12191] Add shutil.chown to allow to use user and group name (and not only uid/gid)

[Sandro Tosi]

Sandro Tosi <sandro.tosi at gmail.com> added the comment:

I've applied some of the suggestions Victor made (and also refresh to be cleanly applicable on default).

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Added file: http://bugs.python.org/file22540/shutil_chown-default-v4.patch

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