relax SVN archive

Updated the noe.py sample script to use the new structure.load_spins() user function.

Bug fix in the test_opendx_theta_phi_da() system test.

The load_seq arg to the structure.read_pdb() user function no longer exists.

The position vector is added to the SpinContainer in the load_spins() function.

Created the test_load_protein_asp_atoms_from_pdb() system test.

This tests the loading of all aspartic acid atoms from the single residue in a loaded protein PDB
file.

Bug fix in the Scientific Python PDB object atom_loop() generator method.

The atom name is now returned rather than the element type!

Created the test_load_protein_gly_N_Ca_spins_from_pdb() system test.

This tests the loading of glycine backbone amide N and Ca spins from a loaded protein PDB file.

Added the system test test_load_protein_gly_N_spins_from_pdb().

This tests the loading the glycine backbone amide N spins from a loaded protein PDB file.

Bug fix for the system test of loading the protein backbone amide N spins from a loaded PDB file.

Bug fix for the MoleculeContainer.add_item() method.

The select flag is now set when replacing element 0.

Bug fix for the ResidueContainer.add_item() method.

The select flag is now set when replacing element 0.