Crucible, SheffieldThe supernatural is all-encompassing in Oladipo Agboluaje's reframing of Shakespeare's power play in 19th-century west Africa Every time the court historian turns up, he has a new list of phenomena to report. Arokin (Toyin Oshinaike) brings news of a flying elephant, a gorilla with a tortoise shell and a woman with vipers for hair. There has been a lot of this since Aderemi (Deyemi Okanlawon) retur…