relax SVN archive

The greyscale conversion of graphics is now better.

The molecule, residue and spin container graphics in the spin viewer are now greyscale when deselected.

Added greyscale versions of the molecule, residue and spin graphics.

The info data structure is no longer passed into the container object.

The Container.display() method has been deleted, and the root, molecule, residue and spin container
methods are called directly from the tree.

Split up the spin viewer code into many more modules.

Now each class is located within its own module.

Split out the molecule, residue and spin container code into its own module.

Shifted the spin viewer window code into its own package.

Renaming and rearrangement of the methods of the Container class.

Renaming and clean up of the Mol_res_spin_tree methods.

Created right click select and deselect menu entries for the molecules, residues and spins.