[issue27172] Add skip_bound_arg argument to inspect.Signature.from_callable()

[SilentGhost]

New submission from SilentGhost:

This could only go in 3.6, but it needs proper documentation and test(s).

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nosy: +SilentGhost, yselivanov
stage:  -> test needed
versions:  -Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27172>
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