(Reuters) — A U.S. judge said Valeant Pharmaceuticals (NYSE:VRX, TSE:VRX) and activist hedge fund manager William Ackman must face a lawsuit accusing them of insider trading in Allergan (NYSE: AGN) before making an unsuccessful takeover bid for the maker of Botox. In a Nov. 9 decision, U.S. District Judge David Carter in Santa Ana, Calif., […]