relax SVN archive

Reverted the last commit (r19982) as too much was committed.

The command used was:
svn merge -r19982:19981 .

Added the Sparky peak lists which should have been committed in r19980.

Missing import of the MODEL_M61B variable.

Created test data for the 'M61 skew' R1rho model.

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

This commit follows step 7 of the relaxation dispersion model addition tutorial
(http://thread.gmane.org/gmane.science.nmr.relax.devel/3907).

Renamed the r1rho_on_res dispersion test suite data directory to r1rho_on_res_m61.

Renamed the lib.dispersion.equations module to lib.dispersion.two_point.

Big speeds ups of the lib.dispersion modules.

Many replicated calculations have been shifted outside of the dispersion point loop, as these only
need to be calculated once per function call. Some if statements have consequently been simplified.

Added support for the M61 skew model to the relax_disp.select_model user function back end.

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

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

Added support for the skewed condition (pA >> pB) to the specific_analyses.relax_disp.parameters module.

This is currently done by constraining pA to be greater than 0.85.

Created the M61 skew model target function.

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

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