relax SVN archive

Added a backwards compatibility hook for converting old XML files to the interatomic data design.

This will convert the variable names, deleting the old, and create proton spins and interatomic data
containers populating them with the old spin parameters.

Fixes for the dipolar_pair.define user function backend.

The return_interatom() function now returns a list!

Updated the final_results_trunc_1.3_pre_py2.7.3_v2.bz2 results file for the interatomic data design.

The import of old relax 1.2 results files is now operational under the interatomic data design.

Basic docstring edit.

Bug fix for the printing out of interatomic data containers.

The __repr__() method wasn't skipping all methods.

Added a verbose flag to the generic_fns.dipole_pair.define() function.

The Mf.test_dauvergne_protocol system test now passes with the new interatomic data container design!

This involves lots of changes to the model-free specific code, the dauvergne_protocol auto-analysis,
and modification of the checks in the system test for the additional proton spin containers.

The CSA value is now only set for the 15N spins in the dauvergne_protocol.py system test script.

Added a check to the model-free overfit_deselect() to see if a relaxation mechanism is present.