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Tim, thanks for the feedback.  I'm uploading a new patch
against CVS latest that fixes those issues, and adds docs
and tests.  Also, I cleaned up the code quite a bit, and got
it properly handling (I hope) all the varied combinations of
ints/longs, positives/negatives/zeros etc..

Unfortunately, Montgomery is the bulk of the speedup:
http://trevp.net/long_pow/

But I could split out the negative exponent handling into a
separate patch, if that would be easier.

Anyways, I'd like to add more tests for the exponentiation
stuff.  Aside from that, I think the patch is complete.  And
more robust than previously, though I still wouldn't trust
it until another person or two gives it a serious
looking-over....