relax SVN archive

Created the 'LM63 3-site' model target function.

This is the Luz and Meiboom 1963 analytic model for three exchanging sites.

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

Fixes for the 'LM63 3-site' model equations in the relaxation dispersion chapter of the user manual.

Added the 'LM63 3-site' R2eff calculating function to the relax library.

This is the Luz and Meiboom 1963 analytic model for three exchanging sites.

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

Added the 'LM63 3-site' model to relaxation dispersion chapter of the relax user manual.

This is the Luz and Meiboom 1963 analytic model for three exchanging sites.

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

Added the 'LM63 3-site' model to the relax_disp.select_model user function frontend.

This is the Luz and Meiboom 1963 analytic model for three exchanging sites.

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

Added the 'LM63 3-site' model to the specific_analyses.relax_disp.variables module.

This is the Luz and Meiboom 1963 analytic model for three exchanging sites.

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

Added DOI numbers to a number of bibliography entries for quick links in the relax user manual.

Sectioning improvements for the relaxation dispersion chapter of the relax user manual.

All of the numeric dispersion models are now much more robust.

The real part of the magnetization vector for the A state could, for some parameter combinations, be
either negative or NaN. These situations are now caught, and the R2eff value set to a very large
number.

Fixes for the last revision (r20402) for the mc_sim_all_models flag in the GUI.