relax SVN archive

Improvements for the phi_ex and dw relaxation dispersion model parameters.

These are now stored with the units of ppm^2 and ppm respectively. The conversion to (rad/s)^2 and
rad/s units respectively now is spin specific, allowing mixed spin types (1H, 13C, 15N, etc.) to be
analysed simultaneously.

Added the CR72 model results to the software comparison document for Hansen's CPMG data.

Added the results for the CR72 model optimisation in CPMGFit using Flemming Hansen's truncated CPMG data.

Added support for the 'CR72' or 'Full_CPMG' model to the relax_disp.cpmgfit_input user function.

Fixes for the dispersion linear_constraints() function.

The indices were being incorrectly handled - the i and k index should be one and the same parameter
index.

Simplified the pA >= pB constraint in the dispersion linear_constraints() function.

Added the initial results of the CR72 model in relax for Flemming Hansen's truncated CPMG data.

Renamed the file for comparing different dispersion software with Flemming Hansen's CPMG data.

The CR72 dispersion model equations are now more robust against math domain errors.

This is for the trigonometric functions which cannot handle certain input values.

Fix for the spin container list of parameters for the CR72 model.