Edit gjf option syntax within fix_langevin.txt

  {angmom} value = {no} or factor

    {no} = do not thermostat rotational degrees of freedom via the angular momentum

    factor = do thermostat rotational degrees of freedom via the angular momentum and apply numeric scale factor as discussed below

  {gjf} value = {no} or {yes}

  {gjf} value = {no} or {vfull} or {vhalf}

    {no} = use standard formulation

    {yes} = use Gronbech-Jensen/Farago formulation

    {vfull} = use Gronbech-Jensen/Farago formulation

    {vhalf} = use 2GJ formulation

  {omega} value = {no} or {yes}

    {no} = do not thermostat rotational degrees of freedom via the angular velocity

    {yes} = do thermostat rotational degrees of freedom via the angular velocity