[issue12191] Shutil - add chown() in order to allow to use user and group name (and not only uid/gid)

[Sandro Tosi]

Changes by Sandro Tosi <sandro.tosi at gmail.com>:


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versions: +Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12191>
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