relax SVN archive

Fix for the spectrum list GUI element for a bug introduced at r16705.

The spectrum and relaxation data list GUI elements now use graphics.fetch_icon for all icons.

Renamed some of the methods in the relaxation data list GUI element.

The spectrum and relaxation data list GUI elements now use the user function definitions for icons.

Changed the relax_fit.relax_time icon to the actions.chronometer Oxygen icon.

Added the chronometer.png Oxygen icon.

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

This now includes most of the spectrum and relax_fit user functions.

Bug fix for the Combo_list GUI input element - default values in the UpdateChoices() method can be a list.

With a default value being a list, this is now properly handled and set in the GUI element.

Bug fix for the Combo_list GUI input element - lists of values can now be set.

The combo box data matching was not correct!

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.