stuff up, correct the usage message and update the manpage to match.
Note that the new options aren't wonderfully useful, since cd(4) at least
promptly unlocks the drawer when eject closes the device.
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, ...).
