OK claudio@

- add examples for how to accept mail from external source and for a
specific domain

making files stand-alone, some __restrict additions.
tweaks kettenis@; ports testing and fixes landry@ and jasper@
ok millert@

references into a STANDARDS section;

references into a STANDARDS section;

__returns_twice and __dead instead of depending on GCC's special
handling of these function names.
With input from kettenis@ and guenther@
Fixes a warning from clang
ok matthew@

an empty name, NULL pointer, or a name containing an '=' character.
OK millert@, guenther@

u_int32_t is historical BSD stuff.
fix to match the manpage, namely #include <stdint.h> as a prerequisite.
okay millert@

install sample configs to /etc/.
ok claudio deraadt henning mcbride

OK markus@ henning@ phessler@ jmc@

pointed out by Frank Brodbeck <fab at guug.de>, actual change with & ok jmc

in working condition anymore (assuming there would be interest in running on
it).

Much ports testing of various versions by naddy@ and jasper@
ok matthew@, miller@

equal, but it is more correct)
from Michal Mazurek

Okay otto@.
Found by Michal Mazurek <akfaew at jasminek dot net>, thanks!

ok sthen@

be included in source files that specify POSIX source.  libutil isn't
a standard POSIX library, but no need to be gratuitously incompatible.
Fixes x11/st.
ok tedu, guenther, kettenis

ok kettenis@

regress test.

ok deraadt jsing matthew

There is no reason we couldn't reload|stop a daemon even when _flags is
set to NO.
As a bonus side effect, we can now see usage() on disabled scripts.
discussed with sthen@ and espie@
ok sthen@

stays;
ok henning

can trivially regen the <=4k bit ones.  ok djm@

ok deraadt@ robert@

prompted by deraadt@

okay ratchov@

to /dev/null.