[Python-3000] Backporting multiprocessing?

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    Christian> Oh h...  Are you able to recall a list of the most important
    Christian> bug fixes? Maybe we can get the bug fixes into 2.5.3 before
    Christian> it's too late.

Maybe doing the modest amount of translation required of the 2.6 unit tests
so they run under 0.52 would help.  See what fails and then see what fixes
correspond to fixing those failing tests.

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