Added some value.set user function calls to the script for Sprangers' ClpP data.
Added some value.set calls to the Relax_disp.test_sprangers_cpmg_data_auto_analysis system test.

These user function calls will be used to test a new concept of fixing parameters in the grid
search.  The dw and dwH parameters are fixed to the experimental values, as described in the README
file from Remco Sprangers (in test_suite/shared_data/dispersion/Sprangers_ClpP).