[issue7652] Merge C version of decimal into py3k.

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> (Actually, that's a part of why decimal.py is slow---it's
> using Python's *binary* integers to store *decimal* coefficients,
> so that even simple addition is now a quadratic operation,
> thanks to the binary <-> decimal conversions involved.)

Oh, I forgot this minor detail (base 2 vs base 10).

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<http://bugs.python.org/issue7652>
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