Filmmaker Brydie O’Connor gives herself a rather difficult task with “ Barbara Forever .” She sets out to document the life and career of iconic lesbian filmmaker Barbara Hammer in the same medium the prolific artist was known for. To heighten the challenge, Hammer has already documented much of that herself in many experimental films about living as a queer woman. O’Connor proves herself up to the task by eschewing the traditional cradle-to-grave narrative, peppered with interviews with those