calibrate accels (1D version)

def calibrate_level(self):
        '''calibrate accels (1D version)'''
        self.mav.command_long_send(self.target_system, self.target_component,
                                   mavlink.MAV_CMD_PREFLIGHT_CALIBRATION, 0,
                                   1, 1, 0, 0, 0, 0, 0)