Blanche DuBois (Marin Mazzie) and Stanley Kowalski (Christopher Innvar) battle it out in the Barrington Stage Company production of “A Streetcar Named Desire,” which runs through August 29. by Helen Epstein Go here for information about a live-chat, scheduled for August 23rd, with Helen Epstein on “The Art of Narrative Writing.” “But isn’t he outdated?”…