Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

Sponsored by: Netflix

usr.bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

[expand] add __dead2 annotation to usage

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Mark global functions and/or variables in expand(1) static where possible.

This allows compilers and static analyzers to more thorough analysis.

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

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.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

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

Add support for multibyte characters and for characters that take up
more than one column position.

ANSIify function definitions.
Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by: md5

Consistently use FBSDID

Allow <blank>s to be used to separate tab stop positions with the -t
argument, not just ASCII space characters and commas. Don't count
non-printing characters when determining column position.

If processing of one file fails, try to process the remaining files and
exit non-zero instead of immediately exiting (SUSv3).

remove __P

Boundary check an array holding tab stops.

PR: bin/35590
Submitted by: "Tim J. Robbins" <tim@robbins.dropbear.id.au>

Include missing header files which define functions for which gcc has
builtins (e.g., exit, strcmp).

Don't arbitrarily limit tabstop expansions to 256 characters.

Submitted by: Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>

Use errx(), remove unused #include. Correct SYNOPSIS

$Id$ -> $FreeBSD$

Tweaks to allow compiling -Wall (mostly adding "const" to char rcsid[]).

PR: bin/5529
Submitted by: Shigio Yamaguchi <shigio@wafu.netgate.net>

Do not misinterpret file names with a digit in the 2nd column as
a tab stop specification.

Add usage(), rcsid. Use getopt().
Obtained from: OpenBSD.

BSD 4.4 Lite Usr.bin Sources