Got Mallet HLDA prediction running (and producing nontrivial predictions -- maybe it's working!).
Preserving files from a failed attempt to make MalletHlda do things in bulk.
Whoops!  Two commits ago I forgot to add the mallet HLDA subclass that
does prediction.  Unfortunately I had already changed the file to
(unseccussfully) make batch predictions, so I figured out the changes I
made and reverted them.
Disable part of the hlda progress display.