relax SVN archive

Fixes for the r1rho_on_res_m61.py system test script.

The spins are now different residues. This fixes two system tests.

Fixes for the DPL94 model to make it truly off-resonance.

The tilt angles and R1 data are now used by the target function.

Updated the Relax_disp.test_r1rho_on_res_fixed_time_dpl94 system test for off-resonance data.

The offsets, R1 data, and chemical shifts are now setup or read by the script.

Added an R1 data file to r1rho_on_res_m61, by copying from the r1rho_off_res_tp02 test suite data.

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.