Chin chin! A half-cut treat to see off a dry January, Can You Ever Forgive Me? is an immensely enjoyable and assured tragi-comic memoir, Melissa McCarthy and Richard E. Grant in a spirited double act as a pair of grifting boozehounds in early 90’s New York. McCarthy has made her name playing loud, sweary and angry, but beneath her characters’ luridly detailed, improv-style threats of violence there is usually a blinking pilot light of sadness, marking women who feel beaten down, ignored and overlooked. The puppy-nabbing outsider in Bridesmaids; the minimum-wage worker in Tammy; the aggrieved middle-aged woman ditched by her husband in…