relax SVN archive

Bug fix for the generic_fns.spectrum.replicated_ids() function for when no replicates exist.

This will now return an empty list instead of an error being raised.

Fix for the spectrum.read user function - a RelaxError is now raised if the file name is not given.

This is important for the GUI to prevent unintelligible errors to be presented to the user.

Bug fix for the SetValue() method of the Value GUI input element.

If the value is None, this no longer fails for read only combo boxes.

Added accelerator keys for all of the spin viewer window tree pop up menus.

Large expansion of the pop up menu for the relaxation data list GUI element.

This now includes most of the relax_data user functions.

Fix for the experimental information in the relax data store - the information can now be reset.

Implemented the relax_data.frq and relax_data.type user function definitions and backends.

Simple fix for the Relax_data.test_reset() system test.

Created the Relax_data.test_reset() system test for testing relax_data.frq and relax_data.type.

These two user functions do not yet exist.

Big reworking of the spin viewer window tree element.

Many new pop up menu entries have been added covering almost all of the molecule, residue, and spin
user functions. The methods bound to the pop up menu entries have all been renamed to
'action_'+type+'_'+user function name. And the residue and spin changes checking has been fixed to
include checks for the naming and numbering.