relax SVN archive

Expanded the CR72 model to handle both the R20A and R20B parameters.

The 'CR72 red' model now functions as the old CR72 model where R20A = R20B = R20. All parts of the
code have been modified. The lib.dispersion.cr72.r2eff_CR72() function has been expanded to support
the full Carver and Richards 1972 equations, dropping back to the simplified form if R20A = R20B.

Small fix for the dispersion chapter of the user manual.

LaTeX improvements for the 'NS 2-site star red model' section of the dispersion chapter of the manual.

Added the 'CR72 red' model to the relax user manual.

This is the Carver and Richards 1972 analytic model with the simplification R20A = R20B. The
current 'CR72' makes the same assumption, but that model will be expanded to support R20A and R20B
later.

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

Added support for the 'CR72 red' model to the relax_disp.select_model user function back end.

This is the Carver and Richards 1972 analytic model with the simplification R20A = R20B. The
current 'CR72' makes the same assumption, but that model will be expanded to support R20A and R20B
later.

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

Created the 'CR72 red' model target function.

This is the Carver and Richards 1972 analytic model with the simplification R20A = R20B. The
current 'CR72' makes the same assumption, but that model will be expanded to support R20A and R20B
later.

The code in common with the CR72 model has been shifted into the new calc_CR72_chi2() method.

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

Added the 'CR72 red' model to the relax_disp.select_model user function frontend.

This is the Carver and Richards 1972 analytic model with the simplification R20A = R20B. The
current 'CR72' makes the same assumption, but that model will be expanded to support R20A and R20B
later.

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

Added the 'CR72 red' model to the specific_analyses.relax_disp.variables module.

This is the Carver and Richards 1972 analytic model with the simplification R20A = R20B. The
current 'CR72' makes the same assumption, but that model will be expanded to support R20A and R20B
later.

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

Fix for the Monte Carlo simulations for the numeric dispersion models.

The back-calculation method was not correctly initialising the target function class.

Added the 'NS 2-site star red' model to the relax user manual.

This is the model of the numerical solution for the 2-site Bloch-McConnell equations using complex
conjugate matrices, whereby the simplification R20A = R20B is assumed.

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