Fix for the Relax_disp.test_hansen_cpmgfit_input system test for a new set of errors.

The Hansen R2eff values have been recalculated and the errors are now slightly different.
More fixes due to the cdp.exp_type change.

This follows from http://thread.gmane.org/gmane.science.nmr.relax.devel/4530, the thread about
supporting multiple data types such as SQ+MQ data simultaneously.