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

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

This commit was generated by cvs2svn to compensate for changes in r165009,
which included commits to RCS files with non-trunk default branches.

Vendor patch that adds a microsecond timer function.

Vendor import of harti's begemot library.