relax SVN archive

Bug fix - the pipe switching flag is now propagated all the way to the data store add() method.

The flag was previously not sent to the method so that the creation of a new data pipe always
resulted in a switch to that pipe. This bug is normally harmless.

The loading of a relax state now signals that there has been a current data pipe change.

This is via the status.observers.pipe_switch object.

Modified the status bar to show the current data pipe rather than relax version.

The relax version is shown in the title bar anyway!

Fix for the load_from_store() GUI method - analysis tabs are only recreated if ds.relax_gui exists.

Created a GUI test for loading a relax save state file created in a non-GUI mode.

Added the relaxation data list GUI element to the model-free auto-analysis tab.

The file name can now be passed into state_load() for operation without dialogs.

Created the relaxation data list GUI element for use in the model-free auto-analysis GUI page.

Added the list-remove oxygen icon to the paths module.

Added the 22x22 and 32x32 versions of the list-remove oxygen icon.