James Spader will be the new boss on "The Office." For about a day. Then, it's up to corporate. A press release from Universal reveals that Spader has sealed a deal to join the show on a full-time basis, reprising the character he played during last season's finale's hunt for a new Scranton head honcho. But instead of settling for the desk in Pennsylvania, he ends up climbing much, much higher -- to the top of Sabre. "James will reprise his role as Robert California, this uber-salesman that has...