relax SVN archive

Shifted all of the constant relaxation dispersion variables into the specific module.

All of the dispersion code now uses the variables of specific_analyses.relax_disp.variables.

Converted all of the specific_analyses.relax_disp.parameters module to handle different models.

The R2eff and I0 parameters are now only part of the 'R2eff' model and all other standard parameters
belong to all of the other models.

Changed the Grace string for the rex parameter to be phi_ex.

Changed the phi_ex parameter in the LM63 model back to rex.

Fix for the relaxation dispersion auto-analysis.

The data pipes created for each model optimised are now switched to prior to any operations on the
pipe.

Modified the printouts of the relax_disp.select_model user function.

More spacing before the sectioning printouts in the relaxation dispersion auto-analysis.

Spun out a number of dispersion methods into the new specific_analyses.relax_disp.parameters module.

This is a module of functions relating to the parameters of the relaxation dispersion models.

Updated the backend of the relax_disp.select_model to handle the new model names.

Updated the models in the script for the full relaxation dispersion analysis of Hansen's data.