relax SVN archive

Created a system test to catch bug #21081 (https://gna.org/bugs/?21081).

This uses a truncated version of Troel Linnet's save state attached to the bug report (the data
pipes not used in the model selection have been manually deleted as well as all by the first 3 spins
in the remaining 2 data pipes).

Alphabetical ordering of all of the Relax_disp system tests.

Renamed many of the Relax_disp system tests to bring some order to the naming.

The Relax_disp.test_r1rho_ns_r1rho_2site_to_tp02 system test now passes.

The optimised values have been hard-coded into the system test. They do not match the TP02 results,
but are close.

A number of fixes for the 'NS R1rho 2-site' dispersion model.

The model should now be fully functional. The chemical shift and R1 related data are now assembled
for this model, and the data correctly passed from the target function to the lib.dispersion
module.

Created the Relax_disp.test_r1rho_ns_r1rho_2site_to_tp02 system test for the new 'NS R1rho 2-site' model.

This tests the 'NS R1rho 2-site' model against the R1rho off-resonance test data from the 'TP02' model.

Created a save file for the r1rho_off_res_tp02 dispersion data optimised to the R2eff model.

This will be used for faster system tests.

Rearrangement of the model sections in the dispersion chapter of the user manual.

These are now better separated into different categories.

Added the 'NS R1rho 2-site' model to the relax user manual.

This is the numerical model for the 2-site Bloch-McConnell equations for R1rho data. The code
originates from the funNumrho.m file from the Skrynikov & Tollinger code (the sim_all.tar file
https://gna.org/support/download.php?file_id=18404 attached to https://gna.org/task/?7712#comment5).

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 'NS R1rho 2-site' model to the relax_disp.select_model user function back end.

This is the numerical model for the 2-site Bloch-McConnell equations for R1rho data. The code
originates from the funNumrho.m file from the Skrynikov & Tollinger code (the sim_all.tar file
https://gna.org/support/download.php?file_id=18404 attached to https://gna.org/task/?7712#comment5).

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