groestl: small optimisation (nist5 + 100kH on a 750Ti)

But, almost nothing on X15, no big changes...
whirl: add missing merkle for some pools
Makefile: luffa was using more than 80 regs (10 vs 14ms)

add easy switch for nvcc target arch

and move duplicated sha2 to sph folder
scrypt: fix implicit function declaration
add x17 algo, cleaned djm34 commit

todo: visual studio...
x17: update vstudio project
heavy: warnings and tabs (no changes)
whirlpool: remove dead code, win 2ms in final hash
windows: implements the color option

based on old git implementation (2009)

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
vstudio unix2dos project files
windows: use a static lib of pthreads 2.9.1

built with nmake clean VC-static