4ba39d0 Remove circular dependancy between VirtViewerDisplay and VirtViewer

Authored and Committed by berrange 12 years ago
    Remove circular dependancy between VirtViewerDisplay and VirtViewer
    
    Add many signals to VirtViewerDisplay which are emitted when various
    events occur. This lets us remove all the code in the VirtViewerDisplay
    subclasses which call back into VirtViewer methods. Instead VirtViewer
    can simply connect signals to the display
    
        
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