Added interpolation calculation of theta and w_eff, when dispersion points are interpolated.
Regarding sr #3124, (https://gna.org/support/index.php?3124) - Grace graphs production for R1rho analysis with R2_eff as function of Omega_eff.
Authored by: tlinnet 2014-03-14
Parent: [r22481]
Child: [r22483]
