relax SVN archive

Attempted to put the model-free auto-analysis into a scrolled panel.

The idea is that the analysis panels might be larger than the main app window, so scrolling would be
needed to see it all. This will be important in the custom analysis.

Improvements to the relaxation data list GUI element.

These include having a fixed height for the element, fixes for the setting of the cell data, and a
global panel instead of a panel for just the buttons.

Missing import.

The ds.relax_gui data structure is initialised if absent when associating a pipe with a new tab.

The test_load_state_no_gui() GUI test is now more advanced, using the pipe editor to associate a tab.

The popup menu is not shown if the status.show_gui flag is not set.

The GUI test base class tearDown method now resets the observer objects.

This allows the GUI tests to function after the first.

Fixes for the analysis reset() method.

It has been renamed to post_reset() and now removes all the GUI elements itself. The call to
delete_all() is of no use because it calls delete_analysis() which removes data pipes and
ds.relax_gui data storage as well, and then notifies observers.

The auto-analysis initialisation can now associate with a pre-existing data pipe.

This is useful for bringing a data pipe into an analysis tab.

The data pipe editor now has a new 'Associate with a new auto-analysis' menu entry.