fix a/an grammar in obvious cases

Run Solaris cyclics from statclock() so dtrace isn't locked out by IPL_SCHED
(assuming the machine has a separate statclock() which almost all don't).

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of im

merge a new version of the CDDL dtrace and ZFS code.
this changes the upstream vendor from OpenSolaris to FreeBSD,
and this version is based on FreeBSD svn r315983.

in addition to the 10 years of improvements from upstream,
this version also has these NetBSD-specific enhancements:
- dtrace FBT probes can now be placed in kernel modules.
- ZFS now supports mmap().

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put back the include of dtrace_bsd.h, it actually is needed.

fix this module to depend on the solaris module rather than the dtrace module.
remove an unneeded header.

Prevent autounload while cyclics are still in use.

adapt the cyclic module and profile dtrace provider to netbsd.
for now, just hook the cyclic callback into hardclock().

update cyclic module to the freebsd 8-stable version as of svn r219520.

Apply NetBSD changes to DTrace.

Ok with core@.

Add the FreeBSD 8-RC1 changes for DTrace.

Ok with core@.