Update to 4.1.3 release:
o Upwardly binary compatible with 4.1.2, 4.1.1, 4.1, 4.0.1, 4.0, and 3.x
o Bug fix to FFT multiplication code.
o Bug fix to K6 assembly code for gcd.
o Bug fix to IA-64 assembly code for population count.
o Portability improvements, most notably functional AMD64 support.
o Many minor bug fixes.
o Make portlint happy.