mostly finished excisions

Stash a bit for the sake of modularity before testing.

Main things:
  1) needed multiple emissions (joint or independent) to work, and due to opacity of lexicalTable
  indexing scheme could not for the life of me figure out whether I had
  the input files in the proper format to accomplish this. So, had to
  hack in a new lexicalTable indexing scheme. In order for this task to
  take less than a month, it turned out to be necessary to remove higher
  order emissions and ambiguous characters.

  2) Also to enable multiple emissions in a way that I trusted what was
  happening was what I wanted, had to hack out a huge amount of the
  apparently sophisticated queuing and multithreading ability in
  seqTracks. Judging by some seeming inconsistencies in seqTracks, it
  turned out to be unclear to me whether everything there was necessary
  or functional, but in any case for my current purposes the simple case
  is fine. I can hack on parallelization later on.