Even When It Comes To History, The Customer Is Always Right. By Leigh Rich THE STORY IS all too familiar. The characters are always the same--Wyatt and Virgil, Billy and Ike, Doc Holliday, Johnny Ringo, Sheriff Behan and Big Nose Kate. And the conflict expeditiously plays out at the O.K. Corral. But the latest maverick to arrive in the town too tough to die is a Norwegian scholar with new views on the legendary Arizona gunfight. Far from the cozy comforts of temperate Norway, Odd Are Berkaak isn't the typical Tombstone-ologist. A mild-mannered anthropologist from the University of Oslo who's well-versed in nebulous topics