At Maccarone Gallery, works by Haim Steinbach, Julian Schnabel and Anselm Reyle. Everyone-into-the-pool gallery group shows are a welcome distraction in a steamy New York midsummer, even when the water is tepid and unsightly matter floats to the top, as is the case in “Pretty Ugly,” a jolie-laide ensemble of 75 artists split between Gavin [...]