Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Don't specify SRCS= when it can be obtained from PROGS=

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

Reviewed by: mike

Fix warnings on alpha and re-enable WARNS=2.

Submitted by: Mike Barcroft <mike@q9media.com>

Argh...this isn't ready for WARNS=2 on alpha.

Constify and lockdown with WARNS=2.

Submitted by: Mike Barcroft <mike@q9media.com>
MFC after: 2 weeks

Removed -I${.CURDIR}/.../sys from CFLAGS.

$Id$ -> $FreeBSD$

Correct some style issues in my previous commit.

Submitted by: bde

Changes from OpenBSD:
* Better usage() - correct syntax, display available commands
instead of examples
* Accept command abbreviations
* sprintf -> snprintf (for paranoia)
* manpage capitalisation tweak

Obtained from: OpenBSD

Updated the ch(4) driver and chio(1) command to include volume
tag support. These changes have been tested with a Breeze Hill
Q47 DLT and a DEC DLT2500 media changer. The latter has no
volume tag support.

The chio(1) command was updated to include various flags to the
status subcommand. These flags can be used to select additional
information to be displayed (like volume tags).

A new chio(1) subcommand named 'voltag' has been added which allows
for changes to volume tags inside the media changer controller.
This could not be tested as the Q47 does not provide the functio-
nality.

Submitted by: Hans Huebner

This command doesn't need to be setuid root, it's only asking
for potential trouble.
Reviewed by: security officers.
Noted by: OpenBSD

This commit was generated by cvs2svn to compensate for changes in r23449,
which included commits to RCS files with non-trunk default branches.

Import Jason Thorpe's contribution for an updated SCSI media changer
device (now, finally!).