TEHRAN, Iran (AP) — The artworks are distinctly American — famed pieces in vivid colors wrestling with themes of war, violence, pop culture and commercialism. What’s startling is where they’re on display: In a museum in the Iranian capital, at a time the two countries are locked in conflict. While the city’s streets are lined with anti-American billboards and posters, Tehran’s Museum of Contemporary Art opened an exhibit this week of six works by three American Pop artists of the 1960s -- Roy