Rescue Dawn is screening at several theaters in the area. Check the Brattle calendar for showtimes ofThe Mystery of Kaspar Hauser and Aguirre, the Wrath of God. The last two movies run through Monday. In a recent post, we suggested that summer wasn't the right time for heavy film fare. But Boston won't be able to ignore the physically and mentally demanding work of Werner Herzog, whose movies old and new are showing throughout the......