relax SVN archive

The self.field_pre_run_dir GUI element is now deactivate with the execution lock.

Increased the grid search size in the Relax_disp.test_r1rho_off_res_fixed_time_tp02 system test.

The previous two commits causes the optimisation to fail with the smaller grid size.

The TP02 dispersion model now assumes the chemical shift is that of the major population A.

Previously the linear chemical shift average was assumed.

Fix for the synthetic data for the TP02 dispersion model.

The chemical shift is being set to that of state A, the major species, rather than the non-weighted
chemical shift average. This could also have been set to the population weighted average.

Attempt at fixing bug #21080 (https://gna.org/bugs/?21080).

This was reported by Troels Linnet.

The problem is a standard GUI problem. The text from a wxPython GUI is a unicode string. But relax
requires standard strings. Therefore the gui.string_conv.gui_to_str() function needs to be used on
the return value of the GUI element GetValue() method, but this call was forgotten.

Fix for the TP02 dispersion model.

The rotating frame tilt angle for this model is calculated from the population averaged chemical
shift and not the equal weighted average.

Turned off clustering in the Relax_disp.test_r1rho_off_res_fixed_time_tp02 system test.

This speeds the test up by more than half.

Fixes for the parameter checks in the Relax_disp.test_r1rho_off_res_fixed_time_tp02 system test.

The parameter values had not been updated from when the test was copied from one of the other tests.

Fix for the synthetic data for the TP02 dispersion model.

The nitrogen chemical shift was not converted from ppm to rad/s before being used to calculate the
offsets.

Comment fix for the loop_cluster() function.