Elsa Keslassy International CorrespondentCharlotte Gainsbourg’s directorial debut “Jane by Charlotte,” a documentary about her model-actor mother Jane Birkin, is set to travel to major territories.Represented in international markets by The Party Film Sales, the feature world premiered at the Cannes Film Festival and went on to play at a flurry of film festivals, including New York and Colcoa in Los Angeles.The film, which portrays Birkin, an actor, singer-songwriter and fashion icon who was