relax SVN archive

Added the DPL94 model equations to the relax library.

This is the David, Perlman and London 1994 R1rho 2-site fast exchange model.

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

Updates to the Relax_disp.test_r1rho_on_res_fixed_time_m61b system test.

Added the 'DPL94' model to the relax_disp.select_model user function frontend.

This is the David, Perlman and London 1994 R1rho 2-site fast exchange model.

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

Added the 'DPL94' model to the specific_analyses.relax_disp.variables module.

This is the David, Perlman and London 1994 R1rho 2-site fast exchange model.

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

Completed the lib.dispersion.m61.r1rho_M61() function.

Now the R1 relaxation rate and rotating frame tilt angle are correctly handled. This is not used in
the target functions as support for the R1 and offset is not yet implemented.

Small changes to the r1rho_on_res_m61b dispersion test data.

One R20 rate has been increased.

Fixes for the func_M61b() dispersion target function.

This is the Meiboom 1961 on-resonance 2-site model for skewed populations (pA >> pB).

Fixes for the grid search for the 'M61 skew' dispersion model.

The pA parameter search is now between 0.85 and 1.

Updated the Relax_disp system tests.

This is for the precision change and constraint changes of the last revisions.

Updates for the pA dispersion parameter optimisation constraints.

The parameter is now limited to be between pB and 1. In the case of the limit pA >> pB, then
instead the constraint is between 0.85 and 1.