Can “Funny,” “Musical,” and “Generational Trauma” work in a single movie? You bet your french fries, mustard, and pepper they do! — On its official website, Mother of All Shows is described as a Mother / Daughter Traumedy, and that’s a wonderful description for Melissa D’Agostino’s first feature. For those of us navigating the fraught waters of how to deal with narcissistic parents or negative body image, not only will this resonate…