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)

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

WANRS=6 cleanup for vidcontrol(1):
- Use foo(void) instead of foo().
- Use static where applicable.
- Apply more const's when passing parameters
- signed/unsigned madness
- Avoid namespace collision by adding underscores.
- For 64-bit architectures, use %zx instead of %x
when necessary.
- When storing constants, use const instead of
variable.
- Bump WARNS?= from 2 to 6

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 a -s option for setting the current vty. This should make
life easier if a PS/2 mouse locks up the keyboard (frequent-ish,
but not repeatable).
Tidy up code (a bit) and make it -Wall

Is this a 2.2 candidate ? (although it doesn't -Wall in 2.2 because
of the lack of sys/sysproto.h

Added vidcontrol util from 1.1.5.1+

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