relax SVN archive

Updated the generic_fns.structure.autoscale_tensor() function.

The docstring was changed to epydoc format, the default method changed from None to 'mass', and a
few comments were added.

Updated the docstring of the generic_fns.structure.atomic_mass() function to epydoc format.

Shifted all the relative atomic mass values into the physical_constants module.

Fixes for the generic_fns.structure.atom_connect() function.

The atomic_data dictionary is now expected to be passed into the function.

Fixes for the generic_fns.structure.atom_add() function.

The atomic_data dictionary is now expected to be passed into the function.

Bug fix in the n_state_model.cone_pdb() user function.

The cone_pdb() function is located in the object n_state_model_obj!

Rewrote the docstring for the n_state_model.cone_pdb() user function.

Fixes for the majority of the arg unit tests for the n_state_model.cone_pdb() user function.

The cone_type arg must be passed in as a string.

Fixes for the n_state_model.cone_pdb() user function for the cone_type arg.

Fix for the testing of the force arg of the n_state_model.cone_pdb() user function.

The arg should now be a bool.