My head was full of thoughts about Costas Vaxevanis, the journalist who was arrested and put on trial by the Greek authorities a few days ago for publishing a list of wealthy Swiss bank account holders / tax evaders in his country, when I went to see the American Conservatory Theater's production of Sophocles' Elektra.The play, in an intelligent, new English language version by Timberlake Wertenbaker, focuses strongl…