Audrey Diwan has emerged as one of the most exciting and relevant new voices of contemporary world cinema with her sophomore outing, “Happening.”Working with a tight budget, a fairly unknown lead actress (Anamaria Vartolomei) and a polarizing topic, Diwan was able to deliver a nuanced and relatable portrayal of Anne, a bright young female student determined to rise above her social upbringing who faces an unwanted pregnancy in 1960’s France — at a time when abortion was considered a