relax SVN archive

Updated the Relax_disp.test_hansen_cpmg_data_to_it99 system test for the IT99 model fixes.

Another bug fix for the IT99 model.

This was pointed out by Nikolai Skrynnikov that the omega_1eff definition is incorrect and instead
it should be:

omega_1eff = 4 * sqrt(3) * nu_CPMG.

The relax_disp.write_disp_curves user function is now called from the dispersion auto-analysis.

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.