relax SVN archive

Completion of the core of the molecule-residue-spin data structures.

All of the initialisation of the class variables and objects in all six classes have been shifted
into __init__() methods so that new copies of the objects are created when molecules, residues, or
spins are added to the structure.

The __repr__() methods of all classes have been updated and return a proper text representation of
the objects.

The XList class docstrings have been updated.

Removed an extra newline character from the MoleculeContainer.__repr__() string.

Removed a print debugging statement.

Reversed the order of all the classes in the 'data.mol_res_spin' module.

This is to fix the problem of missing classes during instantiation.

Deleted the add_list() method and added the ResidueList object to the MoleculeContainer class.

Fixed the __repr__() method of the MoleculeContainer class.

Two fixes for the MoleculeList class method __repr__().

Added the variable name = None to the MoleculeContainer class namespace.

This variable is the name of the molecule, which if specified should correspond to a molecule or
chain identifier in the 3D structure file.

Fixed the __repr__() method of the MoleculeList class.

Fixed an incorrect comment in the PipeContainer.