Nora Ephron’s autobiographical novel chronicling the breakup of her marriage to investigative journalist Carl Bernstein (ALL THE PRESIDENT’S MEN) is adapted for the big screen by director Mike Nichols and solidly acted by Meryl Streep and Jack Nicholson. Rachel Samstat (Streep) is Ephron’s stand-in, a New York food writer who falls for and marries Washington political columnist…