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https://github.com/yk0242/incubation-java/commit/7ba1d26997a746a86c9365ac7da36c02daaf22f1
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 * 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