ZABRISKIE POINT / O.S.T.Zabriskie Point just when you thought it was safe to hurtle into the entertainments of the so called counterculture, this half baked slice of nonsense arrived under the direction of Michelangelo Antonioni, who had previously directed Blow Up, a great success. Zabriskie Point eventually became notorious for its Death Valley orgy sequence and the tragic fate of its neophyte star, Mark Frechette, but artistically it served, in the main, to do little but