Matilda’s moms and dads (Stephen Graham and Andrea Riseborough) are dimwits and cheats. Her school’s motto is “Bambinatum est magitum” — “Kids are maggots” — and its headmistress, Agatha Trunchbull (a go-for-broke Emma Thompson), is the type of monster who receives released chin hair to start with, the digicam then tiptoeing backwar