Made changes to the dir argument of systemtest Relax_disp.test_r1rho_kjaergaard.
This is to prepare for:
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]
This is also to test an expected bug, if R1 is not loaded.
Task #7807 (https://gna.org/task/index.php?7807): Speed-up of dispersion models for Clustered analysis.
