Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Extend the "example" section a bit, for other mailers.

Markup fixes.

Cleanups for mailwrapper(8):
- K&R -> ANSI prototype [O]
- Do not bother to do free right before exit() or execve() [O]
- Remove some dead code in addarg()
- Make additional parameters specified in mailer.conf(5)
actually work and document the fact. [N]
- Avoid using __progname but instead use getprogname()
and setprogname() to provide more sensible messages. [O, N]
- Update $OpenBSD$ and $NetBSD$ to reflect the fact that we
have sync'ed with their code.
- WARNS=6

Obtained from/Inspired by: OpenBSD [O], NetBSD [N] (partially)

Fixed the misplaced $FreeBSD$.

Sort sections.

Mechanically kill hard sentence breaks and double whitespaces.

mdoc(7) police: removed final dot from the .Nd call.

mdoc(7) police: remove extraneous .Pp before and/or after .Sh.

mdoc(7) police: sort xrefs.

Use correct paths to postfix the way we install it

remove fullstops from the end of .Xr lines in SEE ALSO sections.

Give the post-fix example a better description.

PR: 21646
Submitted by: "Peter Pentchev" <roam@orbitel.bg>

Fixed broken path /etc/mailer.conf -> /etc/mail/mailer.conf

PR: 21586
Submitted by: tim@desert.net

This commit was generated by cvs2svn to compensate for changes in r54816,
which included commits to RCS files with non-trunk default branches.

Import NetBSD's mailwrapper to redirect /usr/sbin/sendmail to the user's
chosen mailer.

Obtained from: NetBSD