Cosmetic changes to sci.math
Simplified sci.fmin, sci.fmax via extra scale parameter
Module sci.diff: complete, change in interface, cosmetic changes.
New version of sci.alg (almost from scratch), OpenBLAS DLL included for Windows and Linux
Cosmetic changes to sci.dist, updated for new sci.alg
FIX: sci.stat :clear(), update to new sci.alg, use FFI cdata for efficiency, introduce :dim() and :len()
FIX: diff.de randtobest_2_bin (faster), update to new sci.alg, handle non-linear constraints, chances to interface (simpler)
Update mcmc.nuts to new sci.alg, introduce diagonal mass, interface changes.
FIX: dist.lognormal :sample()