Each March France’s splendid OpÈra de Lyon mounts a cycle of operas that speak to a chosen theme. Just now the theme is MÈmoires — mythic productions of famed, now dead, late 20th century stage directors. These directors are Klaus Michael Gr¸ber (1941-2008), Ruth Berghaus (1927-1996), and Heiner M¸ller (1929-1995).