PORCINE provocateur Michael Moore is howling that the Oscars are fixed. Moore - whose popular anti-gun movie "Bowling for Columbine" has been nominated in the Best Documentary category - is lashing out at Sony Pictures Classics for allegedly rigging the contest so he's destined to lose. The wide-bottomed windbag claims Sony, which is distributing rival documentary prize contender "Winged Migration," a boring French bird flick, is exploiting Academy rules to ensure "Columbine" strikes out. The Academy requires that all voters in the documentary category must prove that they've seen every film nominated. As a result, fewer than 400 of the...