relax SVN archive

Renamed the 'ns_mmq_3site_branched' dispersion test data directory to 'ns_mmq_3site'.

Speed up of the Relax_disp.test_ns_mmq_3site system test.

The relax_disp.plot_disp_curves user function call is now skipped as it takes too long.

Loosened the chi-squared check of the Relax_disp.test_ns_mmq_3site system test to allow it to pass.

Another fix for the 'NS MMQ 3-site' dispersion models.

The creation of the Z- matrix had a copy and paste error in that the heteronuclear chemical shift
sign was negated when it should be positive. This was only in one of the two chemical shift
numbers.

Bug fixes for the dispersion analysis when certain data sets are completely missing.

Removed a debugging printout.

Fixes for the 'NS MMQ 3-site' dispersion models - the evolution matrix is now correctly constructed.

Added the results of cpmg_fit minimisation of the cpmg_fit synthetic data for the 'NS MMQ 3-site' model.

Huge speed ups of the relaxation dispersion analysis.

This is due to the removal of huge inefficiencies in the loop_point(), return_cpmg_frqs() and
return_spin_lock_nu1() functions of the specific_analysis.relax_disp.disp_data module. Two new
functions return_cpmg_frqs_single() and return_spin_lock_nu1_single() have been introduces to pull
out the nu_CPMG and spin-lock field strengths for a given experiment and spectrometer frequency.
This avoids calling the loop_exp() and loop_frq() functions from within loop_point() which itself
is often called inside a loop_exp() and loop_frq() sequence.

Completed the 'MMQ 2-site' documentation in the manual.

The equations for the numeric evolution of SQ, ZQ and DQ data was missing.