RICHMOND, Va. — In the PBS American Experience documentary "Death and the Civil War" premiering tonight, bloated Union and Confederate bodies are shown scattered on battlefields and in trenches and bleached skulls and body parts are stacked like cordwood.As the title suggests, death is the central theme of this moving, extraordinarily graphic film based on Harvard University President Drew Gilpin Faust’s acclaimed book "This Republic of Suffering." It chronicles how utterly unprepared a divided nation was for the mountains of dead the Civil War would produce and how that experience forever changed the way the country treats the men and women who give their lives for their nation. "No one thought that this was going to go on this long.