relax SVN archive

Lots of editing of the model-free GUI section of the user manual.

Fix for bug #20197 (https://gna.org/bugs/?20197) - the PyMOL and Molmol macro failure.

The macro creation now only operates on spins called 'N' and assumes these are the backbone
nitrogens. The sidechain tryptophan indole NH data will need to be detected and added later.

Fix for the Relax_data.test_delete system test for the changes to the relax_data.read user function.

Fix for the Relax_data.test_read unit tests for the relax_data.read user function changes.

Fix to the Dasha system test needed for the changes to the relax_data.read user function.

Fix for the N_state_model.test_monte_carlo_sims due to the changed sphere.pdb test suite file.

Relaxation data is no longer loaded by relax_data.read if the values and errors are both None.

Modified the Mf.test_dauvergne_protocol system test to catch bug #20197 (https://gna.org/bugs/?20197).

The sphere test data NE1 and HE1 data is now being used in this system test, triggering the bug.

Small change to the sphere model model-free test suite data.

The trptophan indole data is now merged into the last residue (a glycine) to catch bug #20197
(https://gna.org/bugs/?20197).

The overfit_deselect() printouts are now regularised and match the model-free printouts.