An Israeli documentary, “Censored Voices,” is making waves. Its director has retrieved the 48-year-old audio tapes of Israeli soldiers testifying to acts of brutality and even war crimes supposedly committed during the Six-Day War. When the makers of these tapes (including Amos Oz) went to publish them in 1968, the Israeli censor cut 70 percent of the material. Or so the film claims. I take a closer look.