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)

Switch the default WARNS level for sbin/ to 6.

Submitted by: Ulrich Spörlein

Make this WARNS=6 clean by:
- declaring 'mode2str' as returning a 'const char *'
- prototyping all function
- rename the argument 'version' to 'ver', not to shadow
the now prototyped function 'version'.

Also mark it as WARNS?= 6 clean to try to keep it clean.

Tested by: make universe (including amd64)

Make this WARNS=2 clean by using %j and (uintmax_t).

Reviewed by: tjr@ on audit@
Approved by: silence from sos@

Default to WARNS=2.
Binary builds that cannot handle this must explicitly set WARNS=0.

Reviewed by: mike

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

Set the default manual section for sbin/ to 8.

Back out ru's changes. Soren has requested this and I see no reason
to not just do it. It is his new code that is being actively
developed so he has say over it. ru's direct changes were premature
as they occurred less than 4 hours after it was committed to the tree.

Make this compile with ${BDECFLAGS}, apply style(9), cleanup manpage.

Add atacontrol, a util to control variuos aspects of the ATA.4 driver,
please consult atacontrol.8 for usage..