Kevin Costner is perhaps the most traditional screen icon of our times, with a bedrock all-American image that ranks him with greats like Gary Cooper, John Wayne and Jimmy Stewart. His two new movies in theaters, “Black or White” and the brand-new “McFarland USA,” are both winners, and manage to take on race relations in a personal, down-to-earth, inspiring and apolitical fashion. Hear him talk about those issues, those movies, the magic of sports films, and how he keeps a level head after nearly 30 years of worldwide fame in this fascinating Kozversation