relax SVN archive

Created the relax_disp.write_disp_curves user function.

This is based on feedback from Nikolai Skrynnikov. The user function will generate one file per
spin system and dump all of the R2eff values (measured, back calculated, and errors) into the file.

Fix for the relax_disp.plot_disp_curves user function in the GUI.

The directory argument was incorrectly set to the 'dir' type rather than 'dir sel' type so it was
not shown in the GUI.

Minor equation improvement in the dispersion chapter of the manual.

Modified the relax_disp.select_model user function CR72 model descriptions.

Instead of saying all time scales, the 'CR72', 'CR72 full', and 'MQ CR72' model descriptions instead
now say most time scales.

The CR72 dispersion model descriptions now emphasise the fact that it is not accurate on all time scales.

This is for the dispersion chapter of the user manual.

Fix for the LM63 dispersion model equation in the manual.

Added the new relax IT99 model results to the software_comparison file.

This is for the truncated CPMG data from Flemming Hansen.

Updated all of the relax results for the IT99 model fix.

Bug fix for the Ishima and Torchia 1999 dispersion model.

Their value of omega_1eff is defined in terms of nu_CPMG, hence it is missing the radian unit. This
is clearly a mistake, but is probably compensated by their stated rather than derived definitions.

Updated all of the results for the truncated CPMG data from Flemming Hansen in the test suite.

The results are now different as the errors are now much more precise as they come from all spin
systems rather than just the truncated set of :4, :70, and :71.