The R2eff result save file for the r1rho_on_res_m61 dispersion data now contains the full data set.

The previous file did not contain the full exponential curves.
The get_curve_type() function now works with the spectrum ID.

This specific_analyses.relax_disp.disp_data.get_curve_type() function already existed but it 
operated on all the loaded data.  Now it can handle a single spectrum ID.  The count_relax_times()
function has been added to aid get_curve_type().
The get_curve_type() function is now imported into the dispersion system test module.