Emmanuelle Bercot’s “La Tete Haute” (Standing Tall), an unusual opener for the Cannes film festival, is a raw tale of youth crime that echoes the mood of a France still reeling from last January’s Paris attacks. French movie icon Catherine Deneuve told a news conference in reference to the attacks on the satirical magazine Charlie Hebdo and a Jewish supermarket that killed 17 people, “La Tete Haute” was due to be screened later on Wednesday. “Choosing this film for the opening is a response by the Festival to a difficult year in Europe and especially in France.”