- refer to the section 4 manual page for every device target, whenever
possible
- repair a few minor quoting errors
- repair a few sorting errors
- fix a few device descriptions (ideally they would be synched with the
.Nd line of their manpages, but we are not there... yet)
- minor mdoc fixes
Thanks to jmc@ for review and a lot of constructive criticism.

- homogenize section order
- sort devices inside sections
- make sure all platforms provide a local target (sigh)
- remove a few dead devices not worth mentioning on a few arches while there.
disabused ok deraadt@

ioctl(2), an unprivileged process may allocate a pty and have its owner
and mode set appropriately.  This means that programs such as xterm and
screen no longer need to be setuid.  Programs using the openpty()
function require zero changes and will "just work".
Designed by beck@ and deraadt@; changes by beck@ with cleanup (and
a rewrite of the vnode bits) by art@ and tweaks/bugfixes by me.
Tested by many.

problems noted by fgsch@ and deraadt@

ok hugh@

pointed out by todd@

ok, deraadt@

ok miod@

Tested by various people on various platforms, I'm willing to fix any
breakage this causes.
ok niels@ deraadt@ and mickey@ (after his comments were applied)

make -> ${MAKE}
add phony targets
remove unnecessary subshells
install kernel in a separate target from building.
some SUDO.
okay deraadt@
(checked bootstrap on i386, should be safe elsewhere, and trivial to fix
anyways)

crashes sh, EVEN after that possible fix.  It appears to overflow the
ramdisk _before_ it dumps core.  Noone was shown these changes.  They were
just tossed in.  This is not a development process that will work, so I
am just backing out all the changes in the last 24 hours.

this feels alot like distrib/sets .. mi global and md for everybody that's
gotta be different ..

o properly generate scsi scanner devices
o shorten pty generation shell fragment
o many tweaks for vax (audio what? how did I ever think vax had audio?)