Added the 'NS 2-site star' model to the relax_disp.select_model user function frontend.
This is the model of the numerical solution for the 2-site Bloch-McConnell equations using complex conjugate matrices.
This commit follows step 2 of the relaxation dispersion model addition tutorial (http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).
Authored by: bugman 2013-07-12
Parent: [r20276]
Child: [r20278]
