This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
the 4.3BSD command. Rewritten from scratch after the old man page,
taking account for the different situation with man pages and source
tree hierarchy (re: /usr/src/gnu) of the FreeBSD project.
Reviewed by: wosch (actually loooong time ago)