relax SVN archive

Converted the J(w) mapping test_calc() system test to the new relax data ID string design.

Updated the copyright notice.

Updated the J(w) mapping module to the new relax data ID string design.

Added a check to make sure the relaxation data is of the correct frequency.

The comments have also been updated to be more similar to that of the J(w) mapping module. This is
to allow the J(w) mapping module to be more easily updated to the new design.

Removed some references to residues, as these should be spins.

Fix for the consistency testing calculate() method - the frequency check was incorrect.

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.