relax SVN archive

The test result handling is now performed 100% in test_suite_runner.

Previously each class of test (system, unit, and GUI) were managing a separate instance of
RelaxTestRunner. Now it is all controlled from one spot. This will allow better management of the
tests from the GUI.

The results of the unit tests are now going to the proper sys.stdout stream.

The text was previously sent to the initial stream that sys.stderr is set to. This is overwritten
by relax though to be able to send it to the relax controller. This allows the results to be
captured.

A Yield is being used to allow the controller window to be shown and the cursor changed.

This is for the test suite run from the GUI.

Started to implement the ability to run the test suite from within the GUI.

This still needs a lot of work, as the GUI is frozen the entire time and the results are printed to
the terminal rather than the relax controller.

Added the 'Tools->Test suite' menu entry. This currently does nothing.

The status.test_mode and status.show_gui flags are now initialised only once in the singleton.

This is to prevent them from being overwritten when a reset() call is made.

Stated to adapt the GUI tests to be able to run with relax in GUI mode.

The bad relaxation data error checks in the model-free analysis are now more informative.

The checks in the model-free analyses for correct ri errors now prints out the spin ID string.

The previous errors only showed the spin number and name, causing confusion
(https://mail.gna.org/public/relax-users/2011-10/msg00001.html, Message-id:
<CAO2iSXGUNupwuz4s-gNdRAdB3i6zQCsuem2_EFjgHOPq+6SL5g@...>).

The test suite runner 'tests' arg now defaults to [], which is the proper null value.