relax SVN archive

Fixes for the test_calc() consistency testing system test for the new design.

Some fixes for the consistency testing calculate() method.

Create the specific base class method _sim_pack_relax_data() for packing relaxation data.

This is the method from specific_fns/model_free/main.py, shifted into api_common. The J(w) mapping
and consistency testing code now use this base method as well.

The Dasha system test is now thoroughly checking all of the relax data store.

Updated all of the Dasha module for the new relax data ID string design.

Created a new function called num_frq() for determining the number of frequencies.

Alphabetical ordering of functions in the relax_data module.

The model-free sim_pack_data() now converts the sim_data structure into a dictionary with Rx IDs.

The _relax_data_opt_structs() model-free method now handles MC sim data.

Fix for the call to _relax_data_opt_structs() from _minimise_data_setup().

This was being performed for each relaxation data set, but it should be done only once per spin!