Qt Figure: allow displaying coordinates when hovered axes parent is a uipanel. * Canvas/cc (Canvas::canvasMouseMoveEvent): call "select_object" with the actual Canvas object which may also be a uipanel.

      subroutine xdznrm2 (n, x, incx, retval)
      double precision dznrm2, retval
      double complex x(*)
      integer n, incx
      retval = dznrm2 (n, x, incx)
      return
      end