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.
Updated the modsel.py script to the new relax design.