relax SVN archive

Added a MC simulation elimination section to the dispersion chapter of the manual.

Updated the description of the dispersion auto-analysis in the manual.

Added the tex > 1.0 model elimination rule for the dispersion analysis.

Updates for the 'MMQ 2-site' model equations in the manual.

Returned the 'MMQ 2-site' model equations to those of the Korzhnev et al., 2004 paper.

These equations were not incorrect.

Added text about the relax_disp.insignificance user function to the dispersion chapter of the manual.

Improvements for the dispersion API eliminate() method.

Created a new section in the dispersion chapter of the manual covering optimisation.

This describes the auto-analysis, the chi-squared function, the grid search values, how optimisation
is implemented, the linear constraints used, the diagonal scaling, model elimination, and the use of
OpenMPI. It absorbs the clustering section.

Bug fix for the recently added dispersion API eliminate method.

This was accidentally always eliminating the model.

The relaxation dispersion target function class can now handle cpmg_frqs arguments of None.

This is useful for R1rho models.