[issue8692] Use divide-and-conquer for faster factorials

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Some more ...

- Mark's notes talk about "odd-part-of-factorial".  It would be
clearer if r variable in math_factorial() was called odd_part.

- I would also rename nminusnumbits to ntwos or something else that
explains what it is rather than how it is computed.

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