Comment 2 for bug 506541

I think it would be cleaner to have

        elif keyname == "Page_Up" or keyname == "Up" :
            self.core.NextSequence()

than
        elif keyname == "Page_Down":
            self.core.PreviousSequence()
        elif keyname == "Page_Up":
            self.core.NextSequence()
        elif keyname == "Down":
           self.core.PreviousSequence()
        elif keyname == "Up":
            self.core.NextSequence()