Use long double interface for the other three FP functions
decl after code fix
When doing XS bigint downgrade on old Perl, set the string
Perl 5.6.2 workarounds for bigint downgrade
Performance for PP, and a few pre-5.8 64-bit workarounds
More tests run on 5.6.2 64-bit now
Trim some tests, convert some proofs to new cert format, more tests work with pre-5.8 64-bit