Speed up some testing.  Move znorder to PP.pm
Add lcm.  Better PP legendre_phi.  Prune PP documentation.
Try to use Pari in benchmark, but silently remove if not available
Performance tweaks (small) for bigints
Performance updates for no-GMP, focusing on making test suite run faster.
Right number of extra tests, remove references to old _XS_next_prime
First cut znlog
Merge pull request #8 from bulk88/master

XS tweaks
Remove flags on get_cv