In 'Bring Me the Head of James Franco,' Ian Belknap howls at the poser artists/dilettantes everywhere, but particularly at James Franco A couple of weeks ago, Ian Belknap, who at 47 has the haunted eyes and fixed scowl of the congenitally angry, received an Amazon box in the mail. It had finally arrived, the book he ordered: "Actors Anonymous," the debut novel from James Franco, the actor-author-poet-professor-curat…