Improved parserTests reporting for helping assess selser fixes better.

* In parallel with the 'Even worse' message that reports when
  selser wt2wt fails a non-selser wt2wt passing test, added an
  'Even better' message that reports when selser wt2wt passes a
  non-selser wt2wt failing test.

* Other minor fixes.

Change-Id: I9df68a41bd8e314851e4c2a52646a6ef925c07e0