Added list of R1rho models, which use R1 in their equations.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
bug #21788(https://gna.org/bugs/?21788): Only Warning is raised for missing loading R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
