New Diorama theatre, LondonEphemeral Ensemble's atmospheric but unfocused follow-up to Rewind depicts the west's ecologically ruinous colonisation of Latin America from a feminist perspective The previous show devised by the international theatre company Ephemeral Ensemble was subtle, horrifying and exhilarating: Rewind, about Latin America's "disappeared", landed a punch straight to the gut and was, for me, one of l…