relax SVN archive

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.

Renamed the 'Settings' menu to 'Tools'.

This is to make it more general for the future inclusion of the test suite.

The results viewer window now only executes one user function for the diffusion tensor if PyMOL is missing.

This prevents 3 errors (with windows) from appearing.