Fix to systemtest Relax_disp.test_r1rho_kjaergaard_auto_check_graphs by only comparing X,Y values, and skipping the error.
This is a hack until the error difference bug gets corrected.
sr #3124(https://gna.org/support/?3124): Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.
sr #3138(https://gna.org/support/?3138): Interpolating theta through spin-lock offset [Omega], rather than spin-lock field strength [w1].
