“Killing them Softly” is an expression I never understood but I'll guess that if one needed to kill softly, Brad Pitt’s Jackie would be the right man for the job. “Softly,” writer-director Andrew Dominik’s adaptation of the George V. Higgins novel “Cogan’s Trade," (itself a follow-up to “The Assassination of Jesse James by the Coward Robert Ford") is the Weinstein Company contender for an Academy Award this year. It’s not going to