MPFR.xs - more tweaks to overloading
Makefile.PL - rename USE_64_BIT_INT deefine & add IVSIZE_BITS define.
t/_1basic.t - accommodate overloading tweaks
Changes - Update
t/not_zero.t - accommodate overloading tweaks
t/new.t - accommodate overloading tweaks
t/native_float128.t - alteration to comments