relax SVN archive

Added a map to convert the analysis name in the savefile to that used by add_analysis().

The analysis tabs are now being reconstructed via add_analysis().

Removed some useless code from add_analysis().

A question dialog now appears before loading a save state if the GUI is not in the initial state.

This is just a warning that all data would be lost.

The R1 and R2 tabs are now also self initialised.

The NOE analysis is now initialised within its class (like the model-free setup).

This now allows an NOE tab to be created on demand.

The 'File->New analysis' menu entry now creates a notebook and adds the analysis tab.

This is currently hardcoded to a model-free analysis tab until a wizard is made. The initial sizer
with the relax icon is replaced by a new one containing the notebook. The new method add_analysis()
adds a tab of the appropriate analysis to the notebook.

Removed the 'new analysis' button from the main GUI window - it was too ugly!

The new() method now deletes the contents of the main sizer.

Improvements to the 'new analysis' button.