Added the infrastructure for the unit tests of the specific_analyses.relax_disp.disp_data module.
This is in response to the post http://thread.gmane.org/gmane.science.nmr.relax.scm/19963/focus=5046
by Troels, and is described in my response at
http://thread.gmane.org/gmane.science.nmr.relax.scm/19963/focus=5048.