Changes for version 4.03
- Values less than DENORM_MIN were automatically denormalized to 0 ... but should have been denormalized to DENORM_MIN when greater than DENORM_MIN/2.
- Attend to various other issues involving handling of subnormals.
- Remove Math::Float128 and Math::Decimal64 from PREREQ_PM.
- Add atonv().
- Math::MPFR - perl interface to the MPFR (floating point) library.