Atree release 1.2
~~~~~~~~~~~~~~~~~

Changes in 1.2:

    - Redid atree_train verbosity output, no longer have to click
      after every epoch - scrolling window flaky when training two trees
      simultaneously (because of storage of strings in global variables -
      a quick fix, to be sure, but much better than the old MessageBoxes!)

    - Mult.exe is not a two-bit multiplexor, it's a three-bit multiplexor!
      Boy, do I feel embarrased!  2^11 elements in domain, instead of 2^6,
      which means that it is a lot harder problem than I thought, and would
      explain the longer training times than one would expect from a two-bit
      multiplexor.

    - minor macro name changes to keep Dr. Armstrong happy.

Changes in 1.1:

    - Bug in atree_free() fixed, will free all subtrees now
    - Modified ????_flag assignments in build_tree() that caused
      flaky learning if memory wasn't initialized to zero first.
    - Mult.exe now has verbosity level 1, so it doesn't look like
      it's just sitting there doing nothing