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

[Éric Araujo]

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


----------
nosy: +eric.araujo, rhettinger

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