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)

o Add an 'optional' keyword, which allows files to be in the
specification, but not in the file hierarchy.

PR: bin/99531
Submitted by: skv
Obtained from: NetBSD, originally from Ed Symanzik
Regress. test: test/test05.sh
MFC after: 1 month

Adds sha256 support. While it is a good idea to also add sha384 and
sha512, I did not do that since it is not entirely clear where "the one
true place" to hold their implementations is going to be. Sha256 is
different since mtree already links against libmd.

Make recommended procedure for integrity checking in the manpage
consistent.

Fix a bug with -f spec1 -f spec2 comparison, which prevented
test/tes03.sh from running successfully.

Reviewed by: phk, cperciva

collect all "extern bla" stuff in extern.h in order to get cross-file
type checking. No bugs found.

Remove clause 3 in the copyrights (according to permission in src/COPYRIGHT)
Remove trailing whitespace.

Remove "register" keywords.
Use newspeak functions definitions.

Use __FBSDID over rcsid[]. Protect copyright[] where needed.

fixup for WARNS=4.

de-__P()

Switch over to using the new fflagstostr and strtofflags library calls.

Added support for file flags, mostly merged from the NetBSD version.
The way is now open to schg and sappnd key files and directories in
our tree. There are recommendations in bin/15229.

PR: bin/15229
Reviewed by: imp, brian

$Id$ -> $FreeBSD$

Add support for SHA-1 and RIPEMD160, now that libmd includes them. Make
all of the hashes (including MD5) conditionalized in case we want
to turn one of them off later.

Create a new flag, "nochange", which will specify that a directory is
to be created if it's missing, otherwise completely ignore it's modes and
owners. Primary intended targets: /usr/src and /usr/obj.

Adjust the 'not created: File exists' message to mention that it's a
directory that's the problem, otherwise it doesn't make sense.

I had created chown-style -L and -P flag to control logical/physical mode
(ie: whether symlinks were followed), but the nochange flag is enough to
get the blasted thing out of my hair so I took them back out.

Use err(3) instead of local redefinition.

mtree * MD5 = better security

Idea from: Dr. John T. Wroclawski

1. Remove commented out CFLAGS+=-DDEBUG from Makefile

2. Clean up code so it compiles -Wall (except for sccsid's and copyright).
This included fixing several printf formats that where not correct,
and changing the data types of a few things.

3. Implement new option -i that produces indented mtree output files.

4. Implement new option -n that turns off directory comments.

5. Only emit /set records if something has changed since the last one.

This commit was generated by cvs2svn to compensate for changes in r1553,
which included commits to RCS files with non-trunk default branches.

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