The autumn gathering of defenders of human rights, agitators for thought, fans of subversion, brewers of diversity and inventors of the possible, the Festival des Libertés, or Freedom Festival, is brimming with documentaries, shows, exhibits and concerts.    Every form of expression is geared to their time, engaged in a critical approach, inspired by the promotion of a fairer world, and brought together in the friendly, festive atmosphere that the festival is known for.