- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

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

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

Changed "conscontrol unset" to accept an existing virtual
console device as an argument. Unsetting virtual console
using /dev/console seems to have never worked.

MFC after: 3 days

Switch the default WARNS level for sbin/ to 6.

Submitted by: Ulrich Spörlein

Sync program's usage() with manpage's SYNOPSIS.

Note that conscontrol set and unset are an interface for TIOCCONS.

Add to conscontrol(8) "set" and "unset" commands which modify the
virtual console set-up. Specifically, "conscontrol unset" will cause
printf(9) output to start going to the console again.

Assorted markup, grammar, and spelling fixes.

Explain what console names are valid.

Recognize if the user supplies the full pathname to /dev/console and friends,
and DTRT.

Explain if he supplies a pathname that is not in /dev.

The .Nm utility

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

Reviewed by: mike

Put WARNS into the right place.

Style and WARNS cleanups.

Submitted by: ru

Mdoc fixes and clarification.

Submitted by: sheldonh

Add a manual page.

Add conscontrol, a front end interface for manipulating consoles.