The publication of Victor Klemperer's secret diaries brings to light one of the most extraordinary documents of the Nazi period. "In its cool, lucid style and power of observation," said The New York Times, "it is the best  written, most evocative, most observant record of daily life in the Third Reich." I Will Bear Witness is a work of literature as well as a revelation of the day-by-day horror of the Nazi years.                           A Dresden Jew, a veteran of World Wa