relax SVN archive

Fix for the lib.dispersion.ns_2site_expanded.r2eff_ns_2site_expanded() function.

The pg variable should have been pA and it needs to be sent into the function.

Added the 'NS 2-site expanded' R2eff calculating function to the relax library.

This is the numerical model for the 2-site Bloch-McConnell equations expanded using Maple by Nikolai
Skrynnikov. It originates as optimization function number 5 from the fitting_main_kex.py script
from Mathilde Lescanne, Paul Schanda, and Dominique Marion (see
http://thread.gmane.org/gmane.science.nmr.relax.devel/4138, https://gna.org/task/?7712#comment2 and
https://gna.org/support/download.php?file_id=18262).

This commit follows step 3 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Added the 'NS 2-site expanded' model to the relax_disp.select_model user function frontend.

This is the numerical model for the 2-site Bloch-McConnell equations expanded using Maple by Nikolai
Skrynnikov.

This commit follows step 2 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Added the 'NS 2-site expanded' model to the specific_analyses.relax_disp.variables module.

This is the numerical model for the 2-site Bloch-McConnell equations expanded using Maple by Nikolai
Skrynnikov.

This commit follows step 1 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Added support for nesting to the relaxation dispersion auto-analysis for the 'NS 2-site 3D*' models.

Updated the 'NS 2-site 3D' and 'NS 2-site 3D red' models in the dispersion chapter of the relax manual.

The models are now included in the tables and in the introduction.

Updated all of the numerical model sections of the dispersion chapter of the manual.

This includes additions for the 'NS 2-site 3D' and 'NS 2-site 3D red' models.

Added support for the 'NS 2-site 3D red' model to the relax_disp.select_model user function back end.

This is the 'NS 2-site 3D' model with R20A = R20B = R20.

This commit follows step 6 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Created the 'NS 2-site 3D red' model target function.

This is the 'NS 2-site 3D' model with R20A = R20B = R20.

This commit follows step 4 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Converted the Citations chapter of the relax user manual into a preface chapter.