relax SVN archive

Added the checks module to the specific_analyses.relax_fit package __all__ list.

Removed the text that the inversion recovery experiment is not implemented yet.

This is in the documentation for the relax_fit.select_model user function and is in preparation for
completing this.

Fix for the recently broken Relax_fit.test_curve_fitting_height_estimate_error system test.

The relax_fit.select_model user function is now called as this is no longer performed in the
auto-analysis.

Improved the checking in the relaxation curve-fitting analysis.

The new specific_analyses.relax_fit.checks.check_model_setup() function is now called prior to
minimisation and in the get_param_names() API method to prevent Python errors from occurring due to
missing data structures. In addition, the pipe_control.mol_res_spin module function
exists_mol_res_spin_data() has been replaced with check_mol_res_spin_data().

Created the new specific_analyses.relax_fit.checks module.

This creates the check_model_setup Check object, following the check_*() function design at
http://wiki.nmr-relax.com/Relax_source_design#The_check_.2A.28.29_functions. This will be used to
make sure that the exponential curve model is set prior to executing certain user functions.

Added a button to the R1 and R2 GUI analyses for executing the relax_fit.select_model user function.

This is just after the peak list GUI element and before the optimisation settings. It allows
different curve types to be selected for the analysis.

Removed the relax_fit.select_model user function call from the relax_fit auto-analysis.

This is to allow the user in a script, or in the GUI, to choose the model themselves.

Expanded the relaxation curve-fitting chapter of the manual to include descriptions of the models.

A new section at the start of this chapter has been added to explain the different models and their
equations. This was taken from the script mode section and expanded to include the new saturation
recovery experiment.

Improvement for the relax_fit.select_model user function in the GUI.

Unicode text is now being used to display the parameters as R_x and I_0 and to show an infinity
symbol in the Iinf parameter. The Rx and Iinf parameters have been added to lib.text.gui to allow
this.

More editing of the relax_fit.select_model user function.

The IR and SR abbreviations have been added, and a lot of text cleaned up.