Added the support for the pA.dw^2 parameter 'padw2' to the dispersion specific analysis.
This is needed for the Ishima and Torchia 1999 2-site model for all timescales with pA >> pB.
This commit follows step 5 of the relaxation dispersion model addition tutorial (http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).
Authored by: bugman 2013-06-10
Parent: [r20011]
Child: [r20013]
