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

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

Apply style(9) and unbreak build.

This went unnoticed during the WARNS bump, as this tool is not connected
to the build.

Add support for selecting from multiple tuners.

Suggested by: usleepless <usleepless@gmail.com>

Tidy up forrmat. No functional changes.

Change formatting to be more compliant with style(9). Doubtless
others will find more things to change.

Change copyright notice to the FreeBSD 2 clause notice.

Approved by: John Wehle <john\@feith.com>

Set channel utility for Hauuapuge PVR-250 and PVR-350.

This s part of an import of the PVR-250 driver. Originally it was
calleed pvr250-setchannel, but it seems better to improve this program
to work for any tuner card, so I'm starting with a more generic name.
That shouldn't mislead anybody: currently the program only works with
the (yet to be committed) cxm driver.

Contributed by: John Wehle <john\@feith.com>