relax SVN archive

Added the IT99 model to the software comparison table for Hansen's CPMG data.

This includes only the results from relax (and possibly not fully debugged results at that).

Removed an unnecessary calculation from the lib.dispersion.it99.r2eff_IT99() function.

Added the relax optimisation results for the IT99 model applied to Flemming Hansen's CPMG data.

Basic fixes for the lib.dispersion.it99 module.

Fix for the setup of the relaxation dispersion target functions for the IT99 model.

Changed the CPMGFit grid search options for the IT99 model in the relax_disp.cpmgfit_input user function.

Fixes for the IT99 model for the relax_disp.cpmgfit_input user function.

Fix for the LM63 model for the relax_disp.cpmgfit_input user function.

The grid search was incorrectly set up - the parameter is Tau, not tex.

Fix for the relax_disp.cpmgfit_input user function for when no directory is given.

This was causing tracebacks.

Missing import of the MODEL_IT99 variable.