Removed the relax_disp.exp_type user function page from the new analysis wizard.
Modified the dispersion GUI analysis to handle the relax_disp.exp_type user function changes.

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.

The experiment type GUI element has been removed, the CPMG and R1rho model lists merged into one,
and much code for the experiment type removed.  The peak analysis wizard will need to be heavily
modified for the changes.