relax SVN archive

The spin viewer window is now using the new build_uf_menu() function for its menus.

Shifted the user function menu creation into gui.uf_objects.build_uf_menus().

This will allow the code to be reused by the spin viewer window.

The GUI user function storage object now populated itself.

This singleton object is no longer populated from the main GUI object, shifting the auto_generate()
method code into the singleton instantiation. The user function __call__() method not extracts the
main window GUI object for use as the parent of the wizards, if a parent is not supplied.

Removed the dependence on the old GUI user function system.

Now the GUI user function storage object is used throughout.

The user function GUI objects can now be called with the 'parent' keyword arg.

This allows a window other than the main relax window to be the parent, preventing the main window
from always coming to the front.

Converted all of the GUI code to use the auto-generated user function design and storage object.

The Uf_page.create_page() method now accepts the 'sync' arg for deciding user function operation.

Fix for the Uf_page.create_page() method - the wizard instance is now passed into the method.

Shifted the user function page creation into the Uf_object.create_page() method.

This will be useful for the creation of the special wizards which are composed of many user function
pages strung together. In this case, the __call__() method which creates and packs the page into a
Wiz_window instance can be bypassed.

The Spectral_error_type_page class now inherits from Wiz_page as UF_page has been eliminated.