open the raw character device for nicknames (so that eject will open the
CD even without medias). Implement the raw_to_blk pathname conversion in
umount_mounted().
Create a new 'cdrom' type, add a '-l' switch which will cause a media load
on cdrom devices type.
Add 'sd0, sd1, sd2' nicknames to allow easy use with removable rewritable
disks (ZIP, jazz, MO, ...).