Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not ha

Fix the procfs hole described on current-users, similar to a fix for
FreeBSD by Sean Eric Fagan, but a bit different. This makes the checks
in the same places as sef's FreeBSD patch, but does not hardcode the
"kmem" group into the kernel, and also does a check identical to the
(3) and (4) checks in the NetBSD ptrace(2):

(1) it's not owned by you, or is set-id on exec (unless
you're root), or

(2) it's init, which controls the security level of the
entire system, and the system was not compiled with
permanently insecure mode turned on.

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backout previous kprintf changes

printf -> kprintf, sprintf -> ksprintf

Add a missing PHOLD()/PRELE() pair.

miscfs prototype changes

initialize variable as pointed out by David Jones <dej@qpoint.torfree.net>
this should fix pr #699

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Minor update from JSP after merging my changes.

Update to 4.4-Lite fs code, with local changes.

PG_COW -> PG_COPYONWRITE to match earlier changes in vm_page.h.

make it compile (cleanly) for us

add new procfs code, from Jan-Simon Pendry, jsp@sequent.com.
This is pretty-much "virgin", so that diffs can be done later.