. Avoid running Model I/III-only xtrs utilities on Model 4
remove cd/cmd:#D#
remove pwd/cmd:#D#
remove unix/cmd:#D#
remove mount/cmd:#D#
remove umount/cmd:#D#
remove truedam/cmd:#D#
rename cd6/cmd:#D# cd/cmd:#D#
rename pwd6/cmd:#D# pwd/cmd:#D#
rename unix6/cmd:#D# unix/cmd:#D#
rename mount6/cmd:#D# mount/cmd:#D#
rename umount6/cmd:#D# umount/cmd:#D#
rename truedam6/cmd:#D# truedam/cmd:#D#