relax SVN archive

Missing import.

Fixes for the GUI tests tearDown() method.

All wx events are now flushed before the deletion of GUI elements.

Fix for the user function window titles for when 'title_short' is not in the definition.

If 'title_short' is missing, 'title' will be used instead.

Better handling of the GUI wizard termination.

The _handler_close() method is now handling the close events and together with the _ok() method,
both now execute the current page's on_next() method. This means that on_next() is called for all
avenues for exiting the wizard. This allows the user function pages to unregister themselves with
the observer objects.

The wizard window _cancel() method now calls the current page's on_next() method.

This allows the page to clean itself up.

The pipe.delete user function now operates synchronously in the GUI to avoid the GUI blowing up!

The GUI analysis pipe_deletion() method now works with pipe bundles instead of pipe themselves.

This is because the analysis tabs are now associated with the bundles rather than pipes.

The 'bundle' arg is now functional in the model_selection user function back end.

The user function pages are now registered and unregistered with the 'gui_uf' observer object.

This allows the ComboBox args to be properly updated with asynchronous user function calls. The old
update method suffered from racing and hence often updated before the user function had executed.
Now the on_display() method registers the GUI user function page update_args() method, and the
on_next() method unregisters it, allowing the observer to update the page only when it is visible to
the user.

Whitespace fix.