1/ API change: gp_log_add_func callback is passed str instead of bytes 2/ Add some GPPort methods. This allows a port to be reset when an error occurs. 3/ Pass CameraFile to gp_camera_capture_preview & gp_camera_file_get. Optional - one will be created if needed. 4/ Remove Context::camera_autodetect method deprecated 3 years ago. 5/ Rename Context, PortInfo & PortInfoList. Add aliases of old names. 6/ Update libgphoto2 to v2.5.31.