relax SVN archive

Added checks for the proton frq for the relax_data.read and relax_data.back_calc user functions.

This is in response to the problems seen by Martin Ballaschk <ballaschk att fmp-berlin dott de> and
reported at http://www.mail-archive.com/relax-users@.../msg01179.html (Message-Id:
<533CDA92-36FE-4E36-8925-7536EFF2608E@...>).

If the frequency is not exact or is less than 1 MHz, warnings are now given to the user.

Fix for the Mf.test_mf_auto_analysis() GUI test.

The recent changes registering the user function update_arg() method with the gui_uf observer object
means that direct calls to the user function page on_execute() method will no longer work. The
wizard needs to be run to completion! Therefore the run() or _ok() methods of the wizard holding
the page should be executed instead.

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.