relax SVN archive

The GUI Main instance is now stored in the wx.App as self.gui.

This will allow access to the GUI class via wx.GetApp() calls, avoiding the need to pass the
instance around.

Fix for the script user function GUI element for opening the file dialog.

Removed some now unused class variables.

More indentation fixes (introduced at r14608).

Fix for an indentation problem introduced at r14608.

Fixes for the relax controller and pipe editor and results viewer windows under MS Windows.

These windows were all dark grey, the default frame colour under MS Windows. Now all elements are
packed into a wx.Panel which sits inside the wx.Frame.

Added checks for a current data pipe to a number of GUI user function pages.

This prevents relax errors when trying to launch the user functions but when no data pipes exist.

The screen is no longer cleared prior to relax execution on MS Windows.

This prevents the Windows PowerShell history from being wiped out.

Fix for the MS Windows BAT file so that relax can be launched from the Windows PowerShell.

Fix for the dauvergne_protocol model-free auto-analysis with the deletion of data pipes.

Now only the data pipes created by dauvergne_protocol are deleted. This fixes the problem whereby
data pipes from other analyses are deleted by dauvergne_protocol, breaking the GUI.