Cleanup gp_release help a bit.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
Move line to -V and improve guide a bit.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
--help cleanup for gp_setup

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>