relax SVN archive

Created a directory for holding relaxation dispersion sample scripts.

Updated the relax results for the truncated CPMG data from Flemming Hansen.

This is for the recent fixes of the CR72 model equations. Now relax produces identical results to
ShereKhan for the LM63 and CR72 models!

Fix for the CR72 model equation in lib.dispersion.cr72.r2eff_CR72().

The eta scaling factor was incorrect.

The back calculated R2eff values are now stored for dispersion analysis after minimisation.

Removed a line of unused code.

Fix for the grid search setup for the pA dispersion parameter.

As pA > pB, then the region from 0.0 to 0.5 does not need to be searched.

Fixes for the CPMGFit results in the software comparison table for Hansen's CPMG data.

Updated the relax results for Hansen's CPMG data for the recent phi_ex and dw changes.

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.