relax SVN archive

Modified the bond_vectors() method for the new structural object design.

Deleted the Scientific python structural object add_struct() method.

Redesigned add_molecule(). The method now is one line long!!!

Bug fix for one of the checks in pack_structs().

Updated the relax intro copyright notice for the relax development team to 2009!

Removed some redundant code.

Started to redesign add_struct() to remove the struct_index arg and convert to the new model design.

The API base class function get_model() has been added to return or create the desired model. The
add_struct() method has been renamed to add_molecule(). Much work remains to be done.

Support for models vs. molecules and the elimination of struct_index in bond_vectors().

Fix for the struct_index arg unit test of structure.vectors().

The arg is now called 'model'.

Added a verbosity flag to parse_token() so that print outs are suppressed by default.