relax SVN archive

Split up of the generic_fns.selection module.

All of the methods relating to the molecules, residues, and spins (including the spin selection
string and associated functions and the spin selection object) have been shifted into the
generic_fns.mol_res_spin module. The functions remaining in generic_fns.selection are related to
purely the selection and deselection of spins.

Added automatic indexing for the model selection techniques.

Fixed the indexing in the fetch_docstrings.py script.

Indexing fixes.

A few more updates to the development chapter for the new design.

Updated the development chapter to the new relax design.

Removed a LaTeX file which was split into separate chapters long ago.

Changed all index entries of 'computer programs' to 'software'.

Added the GPL to the index.

Updated the rest of the model-free chapter of the relax manual to the new design.