'Draw the footer in the TUI window.'

def footer(self):

    screen = self._stdscr.subwin(1, 80, 23, 0)
    screen.bkgd('    ', curses.color_pair(1))
    normal = curses.A_NORMAL
    copyleft = self.__copyleft
    screen.addstr(0, 0, copyleft.center(79), normal)
    screen.refresh()
