- "./run_all --fast" parallelizes all Python tests. Perl and C++ tests
are not guaranteed to run in an isolated environment, so run them
serially instead.
- Adjust some tests in order to recognize them as Python.
- Added diag.t, which simply runs the 'diagnostics' command and captures output.
The output will be gathered and stored by Flod, which means we can monitor the
platform characteristics.