'Dead Man Down' is dead, down in debut
                                
                                
                                    (Newser) -
                                    Oz the Great and Powerful cast a box office spell this weekend, overcoming  lukewarm reviews  and raking in $80.3 million—the third-highest March debut ever, says the  Hollywood Reporter . That disarmed Jack the Giant Slayer, which tumbled 63% to $10 million. Identity Thief ($6.3 million) hung in there,...