add a high N-factor scrypt-jane optimization that works best for higher lookup gap values (L=5,6,7...). GTX 780 and better gain 1 kHash/s or more.
speed-ups for Yacoin, Maxcoin, Helixcoin... roll-up to 2014-02-28 version. PLEASE USE TITAN KERNEL for keccak hashing on Compute 3.5 or better!
Merge with upstream
Merge remote-tracking branch 'upstream/master'