The creators of 'Matilda' have worked their magic all over again. And again. 'Groundhog Day,' now open at the August Wilson Theatre, is a textured, twisted and ticklish comic musical from composer Tim Minchin and director Matthew Warchus. The book is by Danny Rubin, who also co-wrote the screenplay to the 1993 film starring Bill Murray. With a cast led by Andy Karl, as the cynical TV weatherman stuck in a time warp, 'Groundhog Day' shares with 'Matilda' both an intriguing darkness and enough on-stage razzle-dazzle to seize your attention and hold it across two generally gut-busting acts.