Created the new Relax_disp.test_ns_r1rho_3site system test.
This was copied from the Relax_disp.test_ns_r1rho_3site_linear test and modified to use the new 'NS R1rho 3-site' model synthetic data.
Authored by: bugman 2013-12-09
Parent: [r21922]
Child: [r21924]