[issue13266] Add inspect.unwrap(f) to easily unravel "__wrapped__" chains

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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versions: +Python 3.4 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13266>
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