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

[Petri Lehtinen]

Changes by Petri Lehtinen <petri at digip.org>:


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nosy: +petri.lehtinen

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