relax SVN archive

The Sequence GUI elements now default to not being read-only.

Fix for the pipe editor - this window is now the parent for the user functions it calls.

Therefore the pipe editor no longer disappears behind the main relax window.

Fix for the 'Help->Licence' menu entry.

The GPL text from the gpl() function docstring is now printed, as this is no longer a user function.

Fix for the 'Tools->System information' menu entry.

The frq user function class submenu mnemonic is now 'f', conforming to the other user function classes.

Improved the keyboard mnemonics for the user function sub-menus.

There are no longer any clashing letters.

The user function menu has been split in half as it was far too long.

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.