Started working on blow_decrypt, need for speed
Got rid of pthread, wrote blower_decrypt

Still slow for the moment, but using omp at least.
Blower decrypt/encrypt tested to work on 6d

Decrypt is much slower (but safer), encrypt is as fast
as benchmark but assumes a perfect pkzip 2.0 header.
Could potentially be even improved slightly by using encrypt2 for our
header, not sure if needed here since it's probably a very small part of
the global cost.
Merge branch 'master' of github.com:atwam/fishblower