relax SVN archive

Added two methods to the specific analysis common API class.

These are the _model_type_global() and _model_type_local() methods for always specifying that the
model type is global (i.e. at the level of the data pipe) or local (i.e. there can be multiple
clusters of models).

Added support for setting the spin isotope information in the dispersion GUI.

A new Text_ctrl element has been added just after the spin system GUI element. This displays a list
of all the spin isotopes currently defined and is updated after every GUI user function call. The
button of the element launches the spin.isotope user function.

The spin isotope information is now checked for prior to executing the GUI analysis and added to the
missing list to present to the user when blocking the execution of the analysis.

The dispersion GUI test has been updated to use this new element.

Fix for the lib.dispersion package __all__ list.

Fix for the lib.dispersion.equations.calc_two_point_r2eff_err() function.

The variables were incorrectly named.

Another fix for the Relax_disp.test_hansen_cpmg_data_auto_analysis system test.

The correct model list is finally being used.

Added support for the M61 model to the relax_disp.select_model user function back end.

This is for the Meiboom 1961 2-site fast exchange model for R1rho-type experiments.

Fix for an incorrect import.

Fix for the missing import of the lib.dispersion.equations.calc_two_point_r2eff_err() function.

Fix for the Relax_disp.test_hansen_cpmg_data_auto_analysis system test.

The correct model list is now being used - the R1rho-type experiments should not be included.

Updated the relaxation dispersion GUI to handle the current set of experiment types.