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Same deal with the 2nd part of the patch (major format 
changes, minor code changes).  Incidentally fixed an old leak 
bug in long_pow() during the review.  Added code to raise a 
compile-time error (C) if SHIFT isn't divisible by 5, and 
removed long_pow's new hardcoded assumption that SHIFT is 
exactly 15.

Include/longintrepr.h 2.16
Misc/NEWS 1.1120
Objects/longobject.c 1.163

This is cool stuff (& thank you!), but I'm sorry to say I can't 
foresee making time for the 3rd part of the patch for weeks.