Four songs and four seasons provide the pace in “Young and beautiful,” (original title: "Jeune et Jolie") the engrossing film by France’s filmmaker Francois Ozon (“The swimming pool”) in competition this year. They provide a neat way to organize the film but also reinforce our oh-so-wrong expectations as we settle into the quaint family vignettes which he tenders in the first part of his film: a semi-normal family (they