[issue11393] Integrate faulthandler module into Python 3.3

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Ok, good idea, I will do that. I think that I will write it in the
> function comment, something like: "This function is signal safe".

Done in 6685691dfcbd3644feffcb197491bce3168ff5de (git SHA-1)

While checking the usage of signal safe functions, I found a bug: dumpbacktrace_later() signal handler called Py_CLEAR() which is far from being signal safe. I tried to replace it be a pending call, but Py_AddPendingCall() doesn't look to be signal safe. So I just removed the call. cancel_dumpbacktrace_later() is already documented as being required to clear the reference to the file.

> >   - within tests.py, ...
> Ok, I will try to find better names.

Done in db99e17dea187bec4248aca9fc81f673d88dec93. I documented methods and renamed some of them.

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