- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

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

Fix a bug relating to the "files before directories" sort order when
comparing two spec files.

Add a small testcase for the new -f-f mode.

Give mtree(8) the ability to take [two -f spec] arguments and compare
the two specifications to each other.

Make mtree's update function update the modification time too.

Submitted by: Dan Nelson <dnelson@allantgroup.com>
PR: 53063

Update test-case to also fail on filenames containing '#'

Add another test-script for mtree(8): Check symlinks with space in them.

Add a test script which Mtree fails.