relax SVN archive

Last fix for bug #17361 (https://gna.org/bugs/index.php?17361) the loading 1.2.x sim data.

The frequency information is now correctly updated when data is missing.

Completed the test_read_results_1_2_pse() model-free system test for reading relax 1.2.x results.

Bug fix for the relaxation data add_data_to_spin() function - missing data was not properly eliminated.

For the 1.2 results files, the model information is now being setup even if None.

Another fix for bug #17361 (https://gna.org/bugs/index.php?17361) the loading 1.2.x sim data.

This time the global structures were too large - the lists were being appended to for each spin and
simulation, rather than only each simulation.

Fix for bug #17361 (https://gna.org/bugs/index.php?17361).

The chi2_sim structure should have been initialised to a list, not a dictionary.

Added a system test for reading relax 1.2.x version results files.

This is from Sebastian Morin's PSE-4 data, truncated, and is to catch the bug of not being able to
handle simulations.

Error messages are displayed for all the 'Execute relax' buttons when the execution lock is set.

Fix for the error message window - the caption argument default value should be '', not None!

The user function menu entires are disabled during relax execution lock.

This will prevent racing and strange crashing of relax.