specifically, rewrite them to permit some markup in the column headers,
and use "Ta" instead of literal tabs; mandoc does not currently match groff
100%, but a mandoc fix may be some time off, and we've gone enough releases
with poorly formatting column lists.
in some cases i have rewritten the lists as -tag, where -column made
little sense.

.Bl -column header1 header2 ... <Bl flags>
mixing things up confuses mandoc, and adding flags in can screw up the list.
this hopefully just makes things a bit safer (and more consistent).
(one more bit of work left and all column lists should format how we want)

which is used by (amongst other things) initgroups(3) to set the supplemantary
groups on login.
OK pyr@

lines. Problem noticed by me, this solution from halex@.
ok halex aja

ok sthen@ deraadt@

from sthen@

from david@, okay sthen@ and input from schwarze@

Pointed out by miod@

ok deraadt krw

Use bgpd(8) for this which on a peering router often needs openfiles-cur
to be higher than the default. ok henning@ claudio@ deraadt@

smaller improvements; jmc@ and nicm@ both ask me to get this in because
further tweaking will be easier in-tree

is NULL, and third-party software is starting to rely upon this.
Adapted from FreeBSD via Jona Joachim (jaj ; hcl-club , .lu), with minor
tweaks from nicm@ and yours truly.

pointed out by Moritz Grimm (mgrimm-at-mrsserver-dot-net)

better visual cues as to what's happening. Feedback/ok aja@ schwarze@

sthen@ ok.

feedback from miod@ and deraadt@

jasper@

a section will help people looking for just the MALLOC_OPTIONS.
ok otto@ jmc@

ok krw@

we are beyond the nfs diskless /var and /usr mounting.  Issue also
spotted by Hugo Villeneuve, attempt at repair by me.  Let's see how it
works out in practice...
looked at by krw, too

grep in a NFS diskless environment.  Found and fixed by Hugo Villeneuve

fchmodat(2), fstatat(2), mkdirat(2), mkfifoat(2), mknodat(2),
faccessat(2), fchownat(2), linkat(2), readlinkat(2), renameat(2),
symlinkat(2), unlinkat(2), utimensat(2), futimens(2), and
fdopendir(3).
"Minor" libc bump.
Tested in a bulk build by naddy@
Much help from guenther@, thib@, tedu@, oga@, and others.
ok deraadt@, naddy@

ok deraadt@

dd_flags is renamed to the placeholder position dd_unused so that
we can spot "broken software" which assumes we have Jan Simon Pendry's
union mounts (we don't have them, and won't have them ever again).
__opendir2 question spotted by matthew
verified to not break ports by sthen

use-after-free bugs; ok krw@ dlg@ pirofti@

domainname being set.  adjust the scripts to start it in that way.
discussed with pyr

individual pages (based on the existing string man pages). By Tim van
der Molen (tbvdm at xs4all dot nl) after a suggestion by millert@.
ok deraadt

so we can enjoy it on the screen as well
ok deraadt@