relax SVN archive

The 'LM63' and 'LM63 3-site' models are now classified as nested in the dispersion auto-analysis.

The grid search for the 'LM63 3-site' model is therefore skipped and the starting parameters for
optimisation are set to those of the optimised 'LM63' model.

Fix for a typo in the previous commit (r21864).

Fix for the relax_disp.plot_disp_curves user function.

The interpolated curves now have all invalid points of 1e100 removed from the graph. This allows
for reasonable graph scaling.

Fix for the previous commmit (r21862).

Nested model parameters can only be copied if they exist.

The 'CR72' and 'MMQ CR72' models are now classified as nested in the dispersion auto-analysis.

The grid search for the 'MMQ CR72' model will therefore be skipped and the parameters taken from the
'CR72' model. This will however rarely, if ever, be used.

Updated more test suite scripts to call the relax_disp.cpmg_frq user function.

Updated two dispersion scripts in the test data directories to work with the current design.

Fixes for the relax_disp.plot_disp_curves user function - the colours behaviour is now back to normal.

This does not affect relax 3.1.0 and is only a recent bug.

Fix for the previous commit (r21857).

Introduced the eliminate argument for the dispersion auto-analysis.

This flag allows model and Monte Carlo simulation elimination to be deactivated.