Modified specific_analyses.relax_disp.parameters.r1_setup() to initialise the 'r1' variable.
This relates to bug 22541 (https://gna.org/bugs/?22541), the R1 fit flag does not work in the GUI.
This is a hack, as all of the dispersion analysis code assumes that all parameters are initialised.
This is a dangerous assumption that will have to be eliminated in the future.
