Switch to side-by-side view

--- a/src/qtgui/rclmain.h
+++ b/src/qtgui/rclmain.h
@@ -71,7 +71,6 @@
     RclDHistory *m_history;
 private:
     virtual void init();
-    virtual bool eventFilter( QObject * target, QEvent * event );
     virtual void startPreview( int docnum );
     virtual void startNativeViewer( int docnum );
 };