[issue3944] faster long multiplication

[Pernici Mario]

Pernici Mario <pernici at users.sourceforge.net> added the comment:

This patch comes from 30bit_longdigit13+optimizations1.patch in issue4258
with modification for the case of multiplication by 0; it passes
test_long.py and pidigits is a bit faster.

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Added file: http://bugs.python.org/file13394/longobject_diff1

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