relax SVN archive

Changing the model-free model selection now sets a red flag on the button.

The add_button_open() analysis base class method now returns the button.

Added a red flag to use if the user changes the model-free models!

Removal of unnecessary code.

Converted the relaxation data list GUI element to a wx.ListCtrl to match the spectra list element.

Better layout of the spectra list GUI element.

The minimum height is now being set and there is no longer spacing below the list.

Converted the spectra list GUI element from a wx.Grid element to a wx.ListCtrl element.

This is visually more appealing, and is easier to control.

The question() dialog now only appears when the status.show_gui flag is set.

Started to construct the model-free auto-analysis GUI test.

The data checks are still rubbish (it is the NOE code), and the bond length and CSA values are still
not set.

Renamed the local tm and model-free model GUI elements to end in '_field'.

This is to avoid confusion with the model list variables.