Merge pull request #24 from jasiek/master

vw builds on FreeBSD 8.2
almost finished removing --thread_bits
fixed last thread_bits removal bug
removed delay_ring
sender working again now
modified allreduce interface to use float* instead of char *
added single machine parallel and updated documentation a bit
tweaked tag format to allow whitespace
changed substring to begin..end rather than start...end
early termination for BFGS from Miro
generalized adaptive norm
changed internal version to 6.1
fixed pow
added --l1normalize
removed --l1normalize
removed extra print
updated test suite
minor documentation tweaks
moved help to the top
removed unused variables from Ariel