Moved visualizations into application-level menus.
Updated Makefile to include 20newsgroups_treetm and nsfgrants_treetm in itm-demos.
Updated descriptions for corpus, itm, and lda models.
Fixed bugs where ITM_Core and ITM_GropuInBox didn't import db.Corpus_DB. Cleaned up itm/* views.
Really fixed Corpus_DB bug in ITM_Core now.