Added a tweak that allows to replace the hash function use in every 2nd row of Catena-DBG with a galois field multiplication for a major speedup. The multiplication exists in 2 versions of which 1 uses  intrinsics to speed up computation even further. See Readme.md for more details. Also improved the Makefile to detect and set certain Flags
Merge pull request #11 from funkysash/master

Added a tweak that allows to replace the hash function use in every 2nd ...