Input validation
XS tweaks from bulk88
Fixes for 5.6.2
Use constant
Input validation and better 5.6.2 support
Fix threading argument
Work around RT 49569 (Math::BigInt::FastCalc)
Add Kronecker tests
Add bigint tests for new functions
Add tests for legendre_phi
PP legendre phi wasn't making enough primes via public API
nth_prime for legendre phi, not next_prime
Add test for t/81-bignum.t no-clobber
Update version number and date
Move prime_count, nth_prime to XS
More XS->Perl changes.  Add constant SV* returns for -1,0,1,2.
Modify const SV for threads
Another case of RT71548
Change sieve macro advance to not read ahead (valgrind)
Change comment to match current number of array items