Fix for the display of the spin-lock nu1 values in the dispersion GUI tab.
This was reported by Troels at http://thread.gmane.org/gmane.science.nmr.relax.devel/4708.
The GUI spectrum element at gui.components.spectrum was at fault, the add_disp_point() method was buggy.
Authored by: bugman 2013-10-22
Parent: [r21214]
Child: [r21216]