- 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

Add missing opening and closing brackets in getopt_long.3 and getsubopt.3
to make the examples reflect reality more closely.

MFC after: 1 week
X-MFC-After: 9.0-RELEASE

Fix typos, spelling, formatting and mdoc mistakes found by Nobuyuki while
translating these manual pages. Minor corrections by me.

Submitted by: Nobuyuki Koganemaru <n-kogane@syd.odn.ne.jp>

Sort sections.

Markup fixes.

Fix typo, was 'W'; instead of `W;'

Make GNU-compatible following case:
single '-' in command line and '-' (non-first) in options

Make return code in noarg case GNU-compatible

Improve GNU compatibility in several places, use internal GNU_COMPATIBLE
define for it.
Don't catch POSIXLY_CORRECT env. into static variable, it can be changed
on the fly by program.
Use P1003.2 standartized illoptchar[]

Comment out things related to getopt() replacement we not use

Change "-"-started options when POSIX_CORRECTLY is set handling
in favour of GNU instead of NetBSD, because configure's use us and
expect GNU.

Add getopt_long_only() from OpenBSD and other OpenBSD cleanups

PR: 63173
Submitted by: Marius Strobl <marius@alchemy.franken.de>

Add optarg, optind, opterr, optopt, optreset to SYNOPSYS

mdoc(7) police: "The .Fn function".

mdoc(7) police: overhaul.

Approved by: re

Add getopt_long(3).

Obtained from: NetBSD
Sponsored by: Apple