NEW YORK :“Ain’t Them Bodies Saints” is the latest in a list of movies celebrating the American outlaw mythology, but the indie film set in rural Texas in the 1970s focuses more on mood and feelings than blazing shoot-outs and daring prison escapes. For writer-director David Lowery, the impetus for the outlaw romance, which opens in U.S. theaters on Friday, was a desire to be a part of the tradition of classic American storytelling, and to create a film that felt like an old folk song.