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)

Allow to specify only one disk. This is helpful when we want to extend
our concatenated device later.

MFC after: 1 week

Instead of documenting every standard subcommand's argument everywhere,
just leave reference to geom(8).

MFC after: 1 week

- Document 'status' subcommand.
- Update copyrights.

MFC after: 1 week

Sort sections.

Added the EXIT STATUS section where appropriate.

Fix arguments syntax.

Manual pages fixes by: ru
MFC after: 3 days

Grammatical and spelling improvements.

Reviewed by: pjd

- Introduce option for hardcoding providers' names into metadata.
It allows to fix problems when last provider's sector is shared between few
providers.
- Bump version number for CONCAT and STRIPE and add code for backward
compatibility.
- Do not bump version number of MIRROR, as it wasn't officially introduced yet.
Even if someone started to play with it, there is no big deal, because
wrong MD5 sum of metadata will deny those providers.
- Update manual pages.
- Add version history to g_(stripe|concat).h files.

Improve geom(8)'s 'list' command to show geoms and their providers and
consumers. Teach STRIPE, CONCAT and NOP classes about this improvement.

Change naming scheme from /dev/<name>.concat to /dev/concat/<name>.

MFp4: Add 'dump' command to gconcat(8), glabel(8) and gstripe(8) which allow
to dump metadata from given components.

Document sysctl variables.

Based on: simon's patch

Slight markup and grammar fixes.

- Add 'stop' command, which works just like 'destroy' command, but sounds
less dangerous.
- Update manual pages and extend examples.
- Bump versions.

- Add a cross-reference to geom(8).
- Add missing 'a'.

Actually we are also able to list only choosen providers.

Force commit to note, that those manual pages were...

Reviewed by: simon

Add manual pages for gconcat(8), gstripe(8) and gnop(8) utilities.

Supported by: Wheel - Open Technologies - http://www.wheel.pl