(#493) Correct handling of MDI sub window activation.

Setting bool member variable that blocks sub window activation slot
temporarily at the correct places - the main window methods that sets
active viewer and removes a viewer.

ApplicationCode/UserInterface/RiuMainWindow.h

@@ -116,8 +116,6 @@ public:
     void            tileWindows();
     bool            isAnyMdiSubWindowVisible();
 
-    void            blockSubWindowActivatedSlot(bool block);
-
 protected:
     virtual void	closeEvent(QCloseEvent* event);