relax SVN archive

Fixed for the error_analysis() method of the relaxation dispersion auto-analysis.

The method can now handle missing spectrometer field strength data.

Removed the spectrum.error_analysis user function call in the exp_fit.py dispersion system test script.

This is now performed by the auto-analysis.

More unicode strings are used for the GUI for subscripts and Greek letters.

Formatting improvements for the relaxation data list GUI element.

The data type column entries are now descriptive and use subscript.

The delay times column string now specifies seconds in the spectrum list GUI element.

More unicode characters are now used in the relaxation dispersion GUI analysis frame.

The model parameter lists have also been improved.

Removed the 'string' from 'Spectrum ID string' in the spectrum list GUI element.

This is a GUI - the word string is meaningless here!

Unicode is now used for the tau symbol in the model-free model parameter lists in the GUI.

This is only when modifying the models to optimise, which shouldn't be changed anyway.

The relaxation dispersion auto-analysis now performs the peak intensity error analysis.

This is essential for when the GUI is used.

Added some more module variables to specific_analyses.relax_disp for the experiment types.