initial commit.
(#1)[temp: Ticket not registered]
 * Added TaIHeNnStatsMain.java, which repeatedly advances THM, and takes
stats over long letter strings. 
 * Added noHistory mode to THM, to allow for its advancement without
storing char string history internally. Effects: 
   * + speeds up processing
   * + avoid Java heap space Error for long letter strings, by not using
ArrayList storing char string history equivalent
   * - cannot call thm.getStr() to get string history
   * - rather duplexed code resulting from the two modes being present
 * Other minor edits