After seeing two plays in a row based in a mental institution, it’s hard not to go a little crazy. But when the harrowing environment comes with the finessed performances and thoughtful themes of Theater Alliance’s latest, Blue/Orange, it’s worth the trial. In director Jeremy Skidmore’s Blue/Orange, two doctors are treating Christopher (Cedric Mays), a disturbed individual who may or may not be schizophrenic – and also thinks he’s the son of African dictator Idi…