Memory usage for large multiplications

[Niels Möller]

The below patch changes the interface of mpn_mulmod_bnm1, and reduces
the amount of temporary storage needed for mpn_nussbaumer_mul (used for
large products). Passes make check for me, but there are some missing
pieces,

1. Update of the code for the non-recursive case (marked XXX in the
   patch).

2. Squaring. Rather than doing the analogous changes to mpn_sqrmod_bnm1,
   I'd rather break out the CRT logic to a separate, shared, function.

3. An mpn_sub_nc which should be replacable by some cheaper logic
   (marked FIXME).

Regards,
/Niels

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