relax SVN archive

Renamed the MolContainer 'mol' element to 'mol_cont'.

This prevents a clash with the pipe container 'mol' structure.

Another fix for __ave_atom_pos(), related to the last!

Fixes for __ave_atom_pos(). The Scientific python data structure is now in MolContainer.data.

Fixes for __residue_loop(). The Scientific python data structure is now in MolContainer.data.

Regenerated all the results files containing structural info.

Fix for the load_pdb() method.

The 'other' molecule types are now added to a standard list in MolContainer.data.

Fixes for the Scientific python MolContainer usage.

Now all molecules are stored in the MolContainer object to allow for the to_xml() method, which has
now been added. The MolContainer is no longer a list type. These changes will break things!

Bug fix for the MolList.to_xml() method.

The molecule container data was been added by this method and then the MolContainer.to_xml() method
a second time!

Bug fix for the Base_struct_API.to_xml() method.

The model XML elements are now children of the structure XML element.

Modified the Base_struct_API.to_xml() method to only call ModelList.to_xml() if structural data exists.