Added systemtest for setting R20 from minimum R2eff before grid search.
Feature request: #3151, (https://gna.org/support/index.php?3151) - User function to set the R20 parameters in the default grid search using the minimum R2eff value.
Systemtest: -s Relax_disp.test_sod1wt_t25_set_grid_r20_from_min_r2eff.
Authored by: tlinnet 2014-04-25
Parent: [r22854]
Child: [r22856]
