- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r277862: sem_post(): Fix and document semaphore value overflow error.

The error code is per Austin Group issue #315.

I provided different wording for the manual page change.

Submitted by: pluknet

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

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

Cross-reference sem_getvalue(3) from several other semaphore-related
functions.

MFC after: 3 days

Markup tidying.

- libc/sys/sem.c was repocopied to libc/gen/sem.c.
- sem_*(3) manpages were repocopied from libc_r.

Reviewed by: deischen
Repocopy by: markm

The .Fn function

Cross reference sem(4) so users know which kernel options are required
to use these semaphore functions.

mdoc(7) police: Use the new .In macro for #include statements.

Spell "FreeBSD" with "F" and "BSD" in uppercase.

Use the ``.Rv -std'' mdoc(7) macro in appropriate cases.

Reviewed by: ru

Remove whitespace at EOL.

Use ``.St -p1003.1-96''.

Make sem_post() safe to call from within a signal handler, as required by
POSIX/SUSv2.

Change my email address in the copyright notices for the sake of consistency
(jasone@canonware.com --> jasone@freebsd.org).

Reshuffle the SEE ALSO section.

Prompted by: sheldonh

Introduce .Lb macro to libc_r manpages.

Add man pages for the sem_*() functions.

Approved by: jkh