Make grail42 test framework the default.

Add bootstrap060 as trivial test for grail42 test framework.

Update verification_failure exception class to include filename, line,
and source code text.  Add if_not_report to check expression value and
throw verification_failure exceptions.

A few minior changes necessary to integrate to new classes together.

Update test_executor_single_thread_without_test_part_validation and its
unit tests to account for error messages now being included for the
failure cases.