relax SVN archive

The relax_disp.write_disp_curves user function is now more robust for when data is missing.

A small bug fix for the last commit (r21555).

A small output formatting change for the relax_disp.write_disp_curves user function.

Fix for the relax_disp.write_disp_data user function.

The spectrometer frequency in the output files is now in MHz.

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

This is needed as the IT99 model has been fixed and the new relax_disp.write_disp_curves user
function introduced.

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.