Speed up precomputed inverses.
Small improvement to sb_div_q.
Add mpn_tdiv_q to speed.
Remove orphaned memory allocation.
Some very minor speedups/cleanups.
Update compiler flags for k10.
Add rudimentary mpn_mulmod_bnm1. Update to new gcd and xgcd code from GMP.
Whoops, forgot to git add these files at the last commit.
Bring Visual C++ 2012/2013 up to date for latest additions