relax SVN archive

Missing imports of _build_doc()

The deselect user functions now all have documentation created via _build_doc().

Fixes for the select user function docstrings.

The select user functions now have docstrings built by _build_doc().

Added all the select and deselect user functions to the menu.

The molecule, residue and spin bitmaps in the spin viewer window are now updated on a selection change.

The set_bitmap_mol(), set_bitmap_res() and set_bitmap_spin() methods have been created to set the
images on demand, and the update_*() methods call this for new molecules, residues and spins or when
their state changes.

Deselected molecules, residues and spins are now shown in grey in the spin viewer window.

The grey icons are now in the paths module.

Created greyscale versions of all the molecule, residue, and spin icons.

Added some functions for querying the selection state of molecules, residues, and spins.

These are called is_mol_selected(), is_res_selected() and is_spin_selected().