Revert r362148.

Breaks UTF-8 input for new or having only 7bit characters present files.

Reported by: glebius

nvi: fallback to ISO8859-1 as last resort

Current logic of using user's locale encoding that is UTF-8 doesn't make
much sense if we already failed the looks_utf8() check and skipped
encoding set using "fileencoding" as being UTF-8 as well; fallback to
ISO8859-1 in that case.

Reviewed by: Zhihao Yuan <lichray@gmail.com>
Differential Revision: https://reviews.freebsd.org/D24919

Rename O_DIRECTORY to O_TMP_DIRECTORY to avoid shadowing the fcntl.h
O_DIRECTORY flag.

PR: bin/173924
Obtained from: git://repo.or.cz/nvi.git

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

- Import the HEAD csup code which is the basis for the cvsmode work.

Close buffer overflow noted in security advisory DSA-085.
Submitted by: Koga Youichirou <y-koga@jp.FreeBSD.org>
Obtained from: Debian

It is just stupid to have to do ``<ESC>!rm -f %'' to write a file you own.
So lets stop that nonsense and allow `w!' to do something useful.

Submitted by: green

10 X's in mkstemp().

Set the close-on-exec flag when we lock the file we're editing.
This prevents any background sub-command executed from inheriting
the descriptor & lock (and making vi think that someone else is
editing the file when it re-edits).

Remembered from: An OpenBSD commit message from May '99

Import of nvi-1.79, minus a few bits that we dont need (eg: postscript
files, curses, db, regex etc that we already have). The other glue will
follow shortly.

Obtained from: Keith Bostic <bostic@bostic.com>