allow o as 0 in total # of disks in file_id.diz
allow o as 0 in total # of disks in file_id.diz

scriptzteam/pzs-ng,scriptzteam/pzs-ng,bioboy/pzs-ng,bioboy/pzs-ng,scriptzteam/pzs-ng,scriptzteam/pzs-ng,bioboy/pzs-ng,bioboy/pzs-ng,scriptzteam/pzs-ng,bioboy/pzs-ng