relax SVN archive

Updated the r1rho_on_res_m61 dispersion on-resonance data for off-resonance models.

The chemical shifts are now the same for all spins, to force perfect on-resonance, and the two spins
are now different residues.

Removed the unused theta and R1 arguments for the lib.dispersion.m61.r1rho_M61() function.

These off-resonance parameters are not used in the on-resonance model.

Many fixes and improvements for all of the R1rho dispersion models in the user manual.

The equations are now correct and the parameter table updated with new parameters and equations.

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.