The uteri of an undetermined number of Boston women turned themselves inside out today with the news that a Somerville man had been posing as little-known NBA player Jeff Turner on local singles' message boards. Ronnie Craven admitted today that he had been using the name of Turner, an unremarkable power forward/center who played ten seasons for the New Jersey Nets and Orlando Magic, in order to get laid. When reached at his Somerville home......