relax SVN archive

The virtual width of the analysis GUI elements now matches the real width.

The horizontal scrollbar has also been disabled.

Initialized merge tracking via "svnmerge" with revisions "1-13061" from
svn+ssh://semor@.../svn/relax/1.3

Converted all of the analysis objects into instances of wx.lib.scrolledpanel.ScrolledPanel.

This is instead of just having the right hand panel as a scrolled panel, as was tested in the
model-free auto-analysis. The setup of the GUI element has also shifted into the base class in
gui.analyses.base, whereas the analysis specific setup still occurs in the specific classes.

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.