The r1_fit flag is now used to switch between dispersion target functions.
This is as described in http://thread.gmane.org/gmane.science.nmr.relax.scm/22850/focus=6736.
The change makes the '* R1 fit' models now redundant.
Authored by: bugman 2014-08-21
Parent: [r25134]
Child: [r25136]
