Fixed the problems with the classes of the 'data.mol_res_spin' module.
The add_item() methods of the list type classes have been modified. For the MoleculeList class the
'mol_name' argument has been added and the MoleculeContainer.__init__() method accepts this argument
as well. The 'res_name', 'res_num', 'spin_name', 'spin_num', and 'select' have similarily been
added.
