Based on the film by P.J. Hogan. Book by P.J. Hogan, music and lyrics by Kate Miller-Heidke and Keir Nuttall. Sydney Theatre Company and Global Creatures. Lyric Theatre, Sydney, July 4 Muriel Heslop is a bogan, a ratbag, a complete dag. She’s cunning but not terribly bright. The hideous frock she lifts from Target to…