When planning films based on the lives of real, living people, those films are understandably altered when their subjects, well, get assassinated for example. Kathryn Bigelow's 'Zero Dark Thirty,' centering on the Navy SEAL team that hunted down and killed terrorist leader Osama bin Laden, is due in theaters early next year. But prior to bin Laden's death, Bigelow and her writing partner Mark Boa…