- 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)

MFC r280475:

The number of commands added when ddb(4) is enabled is 3, not 2

Sponsored by: EMC / Isilon Storage Division

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

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

- Witness doesn't verify the old MTX_NOSWITCH flag's correctness (that was obsoleted
when critical sections were added). Instead, list a check that witness does perform.
- Note that 'show locks' in DDB takes an optional thread argument.
- Document 'show all locks'.
- Remove the BUGS section, the bug in question was fixed 11 years ago in r76272.

Reflect recent changes to the sysctl debug.witness.watch moving into a
tri-state variable.

Fix all the spelling mistakes I could find in the man pages for words
that have at least 3 characters.

MFC after: 1 week
Thanks to: Music band ``Chingon''
for keeping me company while searching for these.

Don't start a sentence with an identifier.
Add missing cross-references to SEE ALSO.

X-MFC after: 6.0-RELEASE (not a big deal to bother re@)

Assorted markup fixes and minor wordsmithing.

Approved by: re

Document the debug.witness.watch sysctl/tuneable.

WITNESS_DDB is now called WITNESS_KDB.

MFC after: 3 days

document the recent change to debug.witness.*
fix spelling of debug.witness.kdb

MFC after: 5 days

Correct the name of a loader(8) tunable.

mdoc(7) police: s;BSD/OS;.Bsx; where appropriate.

Use a plain .Dv for kernel option names rather than .Qq Dv to be consistent
with other manpages.

mdoc(7) police: fix markup and spelling.

Add a simple manpage describing the basic functionality of witness.
It needs a diagonistics section added at some point in the future.