(Credit: Monika Rittershaus) Barrie Kosky’s new production of Philip Glass’s 1983 opera “Akhnaten,” running through April 20 at the Komische Oper Berlin, represents a long-overdue homecoming. This is the city most intimately connected with “Akhnaten’s” historical legacy; the archaeological treasures of the enigmatic Pharoah’s destroyed city, Tel-El-Amarna, excavated by Ludwig Borchardt with funding from the philanthropist James Simon in 1912 {…}