New regression testing harness.

New regression testing harness.

(testall.out): obsolete.  see individual test output files in the
Output directory.

(testall.py): now contains only the list of all tests

(autotest.py): The new testing harness.  Supports -g option to
generate output files instead of verifying; -w option to warn about
non-tested optional modules; additional command line arguments to
generate or test individual tests (useful for generating output file
of new tests).