relax SVN archive

Renamed the results.read and results.write uf 'directory' arg to 'dir'.

This in both the front and back ends.

Shifted the free_file_format GUI element into its own class.

The wizard page free_file_format() method for generating the GUI element has been shifted into the
components.free_file_format.Free_file_format class.

Fix for the Value.SetValue() method - a variable was mistyped.

Redesigned the free file format window.

The settings module has been renamed to components.free_file_format, as it simply contains the free
file format window. This renaming is in preparation for shifting all of the free file format code
into this module to create a special GUI element object for it, rather than being part of the wizard
page code base.

The Base_window code has been merged into the Free_file_format_window code, as no other windows use
it any more.

Eliminated the ancient unused load_sequence() GUI element.

This was part of the settings menu in the original version of the GUI, but now has no purpose.

Converted the sequence user functions to the auto-generation design.

The model_selection user function now defaults to AIC.

Converted the results user functions to the auto-generation design.

Fix for the Analysis_controller.on_page_changed() method for reset events.

The relax data store now always has a ds.relax_gui object!

Fix for the post_reset() method of the Analysis_controller object.

This unregisters all the analyses from the observer objects, and calls the set_init_state() method
only once all analysis pages are deleted. This in combination with the synchronous reset user
function calling prevents the GUI from blowing up!