Made the model MODEL_NOREX_R1RHO_FIT_R1, be tested in systemtest Relax_disp.test_r1rho_kjaergaard_missing_r1().
bug #22440(https://gna.org/bugs/?22440): The "NOREX" model is not covering R1rho models.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
