relax SVN archive

Redesign of the set up of the molecule container data structures.

The file info is now set by the pack_structs() base API method rather than the MolContainer internal
object or the ScientificPython code.

Fix for the 2 test_load_pdb() unit tests. The mol name is in the mol_name variable.

Reverted r8458. The molecule name is only used as a check, it is stored by other parts of the code!

The command used was:
svn merge -r8458:8457 .

Fix for the test_load_pdb() unit test, in the check of the molecule name.

Fix for the test_atom_loop_spin_selection2() unit test, the molecule now has a name!

Fixes for the test_load_pdb() unit test.

Fix for the test___residue_loop() unit test.

Simplification of the internal structural object atom_loop() method.

There is now only one block of code for the atom looping for the two options of the ave argument.

Deleted all unit tests for the ScientificPython structural object __molecule_loop() method.

This method no longer exists!

Fixes for the Scientific python structural object __residue_loop() unit tests.