Arizona Diamondbacks traded 1B/OF Conor Jackson to the Oakland Athletics for RHP Sam Demel LHP Mark Mulder Retires 1b/OF Darin Erstad Retires Los Angeles Dodgers sign RHP Claudio Vargas Pittsburgh Pirates Call up 3B Pedro Alvarez New York Mets release OF Gary Matthews Jr Seattle Mariners designate RHP Ian Snell for assignment Detroit Tigers release…