Added more models to be tested in sytemtest Relax_disp.test_r1rho_kjaergaard_auto.
bug #22461(https://gna.org/bugs/index.php?22461): NS R1rho 2-site_fit_r1 has extremely high chi2 value in systemtest Relax_disp.test_r1rho_kjaergaard_missing_r1.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
