Improvements for the LaTeX maths commands used in the dispersion chapter of the user manual.
Added Skrynnikov and Tollinger to the copyright notice in lib/dispersion/ns_cpmg_2site_star.py.

I can now see that the code derives from the funNumcpmg.m of the sim_all.tar file
(https://gna.org/support/download.php?file_id=18404) attached to https://gna.org/task/?7712#comment5.
This sim_all.tar file is the original code of Nikolai and Martin.
Modified the relaxation dispersion auto-analysis to take nesting of MQ models.

This is specifically the nesting of the analytic 'MQ CR72' model and the 'MQ NS CPMG 2-site' models.
The analytic solution is now used as the optimisation starting point for the numeric model.