relax SVN archive

Changed the text in the spin systems field to say 'loaded and selected'.

The observer object is called by the spin viewer tree right click menu items.

The right click menu items which call user functions now call
self.gui.user_functions.notify_observers() to update all GUI elements.

The spin viewer tree methods are now refreshing the whole spin viewer rather than just the tree.

The spin viewer frame method refresh() now updates the container object as well.

Renamed the tree info() method to get_info() and fixed its operation.

Created the Mol_res_spin_tree.info() method for returning the python data of the current selection.

The borders are back in the containers of the spin viewer.

Fixes for the root, molecule, residue and spin containers.

These classes are no longer wx panels.

Partly reverted r13453 as the coloured residue graphic was accidentally replaced with the greyscale one.

The command used was:
svn merge -r13453:13452 graphics/wizards/residue.png

The Container class has been split up.

The classes are now Container, Container_base, Molecule, Residue, Spin and Root.