[issue1195571] simple callback system for Py_FatalError

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Here is a new patch; I lifted the pre-Py_Initialize() restriction, because it seems to me that a wxPython application, for example, could use it.
A wxPython application is not embedded, but it already often redirects stdout and even installs a segfault handler.

I also made Py_SetFatalHook() return the previous hook; it could be useful to set a function temporarily, even if this is not thread safe.

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stage: unit test needed -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1195571>
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