Added scripts and results for optimising Sprangers' ClpP MQ CPMG data to the 'MQ NS CPMG 2-site' model.

This includes two scripts for non-clustered followed by clustered analysis using the 'MQ CR72' model
in the auto-analysis so its parameters will be used as the optimisation starting point for the
'MQ NS CPMG 2-site' model.  The results files for both scripts have been added to the repository.
Added the 'MQ CR72' model to the relax user manual.

This is the Carver and Richards (1972) 2-site model expanded for MQ CPMG data by Korzhnev et al.,
2004.

This follows the tutorial for adding relaxation dispersion models at:
http://wiki.nmr-relax.com/Tutorial_for_adding_relaxation_dispersion_models_to_relax#The_relax_manual.
Modified the dwH symbol in the relax user manual.