relax SVN archive

Fixes for the R1 and R2 GUI analyses for the recently introduced unicode subscript characters.

There is now self.label for a pure string version and self.gui_label for the fancier unicode version.

More fixed for the peak intensity error analysis method of the relaxation dispersion auto-analysis.

The fixed relaxation time period type experiments can now be handled.

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.