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)

Bump WARNS where possible.

Checked by: make universe
Approved by: ed (co-mentor)

Remove these MAINTAINER lines since the maintainers has had their
commit bits retired for safe keeping.

Commit 1 of 2 to fix ffsinfo(8) for UFS2.

Update ffsinfo(8) to use new UFS2 support in the growfs(8) debugging
functions. Largely consists of renaming fields and types to be aware
of the UFS1/UFS2 distinction, relying on libufs(3) to open and sanity
check the device/file/label accessed.

Since libufs(3) now handles label/UFS interactions, remove -L argument.

Note: when submitted, this patch had substantial style changes. I've
attempted to remove the restyling from the patch to separate the
functional and style changes.

Submitted by: Lukas Ertl <l.ertl@univie.ac.at>
PR: bin/53517

style clean.

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.

added growfs(8) including ffsinfo(8) to the freebsd base system

Reviewed by: grog