The two new user functions relax_disp.cpmgfit_input and relax_disp.cpmgfit_execute have been created
to interface with CPMGFit. The first creates the per spin system CPMGFit input files as well as a
batch script for executing CPMGFit with all the input files. The second bypasses the batch script
and allows CPMGFit to be executed from within relax. This mimics the palmer and dasha user
functions. The back end code is in the new specific_analyses.relax_disp.cpmgfit module.
