Sort -K option before -k rather than at the top.

MFC after:	1 week
Make ufs_dirhashreclaimperc a percentage for real and
rename it to ufs_dirhashreclaimpercent, as suggested
by jhb@. As an added bonus this avoids divide-by-zero
errors.

Requested by:	jhb, markj
Reviewied by:	jhb, markj
Use the correct variable name.
Add a new soeliminate(1) command

mandoc(1) does not provide an equivalent of the GNU groff's soelim(1) as an
external binary. It does provide the funcitonnality but internally.

Lots if manpages in ports uses ".so" directives to include the content of
another manpage, which works properly if the manpages are not compressed.
With compressed manpages it will fail. So we need to preprocess those manpages
with soelim(1) before compressing them.

soeliminate(1) add the minimum functionnality from soelim(1) required for that
task, in order to still be able to prepare properly those manpages in case we
ship the base system only with mandoc as a manpage renderer.

soeliminate(1) accept all the arguments from soelim(1) for compatibility but
only '-I dir' is really functionnal.

Name it soeliminate and not soelim, so groff from base or ports can still call
soelim(1) for its internal use and avoid potential incompatibilities

MFC after:	1 month
Revert accidently message Makefile from 274836 and connect soeliminate(1)
When doing a PREREAD sync of an mbuf-type dma buffer, do a writeback of
the first cacheline if the buffer start address is not on a cacheline
boundary.  Normally a buffer which is not cacheline-aligned is bounced,
but a special rule applies for mbufs, which are always misaligned due to
the header.  We know the cpu will not write to the header while dma is in
progress (so we've been told anyway), but it may have written to the
header shortly before starting a read, so we need to flush that write out
to memory before invalidating the whole buffer.

In collaboration with Mical Meloun and Svata Kraus.
Make iSCSI frontend less chatty while waiting for tasks termination.

MFC after:	1 week