relax SVN archive

Swapped the generic_fns.relax_re.search() arg order, and fixed all calls to it.

Added a unit test for the generic_fns.relax_re.search() function.

Removed some code checking for deselected molecules and residues.

Only spins can be selected and deselected (one molecule at a time maybe, but still just the spins)!

Some fixes for the test_angles() system test.

'attached_proton' is now called 'attached_atom'.

Another fix for the __find_bonded_atom() Scientific PDB object method.

Small fix for one of the tests in vectors().

Fix for the Scientific PDB structural object atom_loop() method.

Empty molecule, residue, and spin names and numbers are now replaced with None before being returned.

Fix for the atom matching statement in the __find_bonded_atom() method.

Incomplete fixes for the __find_bonded_atom() method.

Fixed the setting up of the bond vector inside the SpinContainer.