- 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)

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

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

This now passes a make universe with WARNS=6.

The last big commit: let usr.sbin/ use WARNS=6 by default.

style.Makefile(5)

Reorder WARNS line for style.

Pointed out by: bde

WARNS=2 cleanup.

PR: bin/32646
MFC after: 2 weeks

Fix some nits I missed in my style cleanup.

Perform a major cleanup of the usr.sbin Makefiles.
These are not perfectly in agreement with each other style-wise, but they
are orders of orders of magnitude more consistent style-wise than before.

Remove GCC'isms in CFLAGS.

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for usr.sbin/ to 8.

Add support for command line editing and history.

Remove src/contrib/bind/bin/nslookup/commands.c as it is generated by lex
from commands.l.

Submitted by: lpc/cdcontrol patches originally by msmith.
Reviewed by: msmith (in theory)

Add the cdcontrol program by Serge Vakulenko. It's my understanding
that this is a superset of cdplay, and perhaps it's time to send cdplay
into the bit bucket if this works well. According to the docs, it has
a friendlier command structure, command line interface etc.
Submitted by: Serge Vakulenko <vak@cronyx.ru>