[issue16500] Add an 'atfork' module

[Dwayne Litzenberger]

Dwayne Litzenberger added the comment:

> The main question is whether a failed prepare callback should prevent the fork from happenning

Yes, I think an exception should prevent the fork from happening.

It's fail-safe for the PRNG case (you can guarantee that a fork won't occur without properly re-seeding a PRNG), and it makes bugs easier to catch in unit testing.

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<http://bugs.python.org/issue16500>
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