relax SVN archive

Converted the Molmol pipe_open() function to the new relax design.

Updated the generic_fns.molmol module to import the relevent functions from the relax_io module.

Converted the test_binary() method into a module function.

Converted the Molmol open_pdb() function to the new relax design.

Converted the Molmol macro_exec() function to the new relax design.

Converted the Molmol create_macro() function to the new relax design.

Converted the Molmol command() function to the new relax design.

Converted all the Molmol class methods into module functions.

Converted the Molmol 'command_history' structure into a module variable.

Huge redesign of the load_PDB_sequence() function (and converted it to the new relax design).

This new function should give much more flexibility and abstraction in the mapping from the
molecular structure to the relax mol-res-spin data structure.