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

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

Cleanup code to make it WARNS=6 clean:

- ANSIfy prototypes;
- Add __unused for parameters that is not being currently used;
- Add a header for subrountines being called from other modules.

Reviewed by: mjacob

Update SES userland examples to something out of the toy stage.
Approved: jkh