Oscar-winning Cannes habitué Marion Cotillard returns to the festival with Guillaume Canet’s  Karma  and Bertrand Mandico ’s  Roma Elastica . These titles bring her Official Selection tally to 16 films since 2011, eight of them in Competition, including Jacques Audiard’s  Rust and Bone , Jean-Pierre and Luc Dardenne’s  Two Days, One Night  and Leos Carax’s  Annette .  Karma  revolves around a woman with a troubled past whose new life is upended by a child’s disappearance, while  Roma Elastica  follows an actress caught up in a crazy film shoot in Rome in the 1980s. Cotillard says both roles appealed to a desire for challenges during a period of transition in her life. DEADLINE: You’ve been coming to the Cannes Film Festival nearly every year since the late 1990s, making your first appearance in the Official Selection in 2011. What does the festival mean to you?…