Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC: sync the version of netmap with the one in HEAD, including device
drivers (mostly simplifying the code in the interrupt handlers).

On passing, also merge r250414, which is related to netmap
and the use of lem/em in virtual machines.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add the cddl/ directory.

Simply running ``make world'' will bomb unless you dig up the
undocumented HISTORICAL_MAKE_WORLD variable and set it. Note it
here so the blow up will not really be a surprise to people who
read.

Link the buildingworld chapter of our handbook in the README
while I'm here.

Add a note explaining what the rescue/ directory is for.

PR: docs/93990
Submitted by: Ulf Lilleengen
MFC after: 3 days

KerberosIV de-orbit burn continues. Disconnect from "make world".

Fix broken handbook links.

Submitted by: "Dipl.Phys. Andreas Hiltenkamp" <hiltenkamp@web.de>

Spell "FreeBSD" correctly.

`buildworld' is no longer a strict prerequisite for `buildkernel'
as of Makefile.inc1,v 1.184.

Fix kernel configuration files path to look MI.

Mention src/kerberos5.

Slightly improve the description of "crypto". "DES" is a subset of
what we have in secure/.

secure/ may be exported now.

Point out, that build/installkernel need a built world and that more
information can be found in the handbook.

Requested by: sheldonh
Reviewed by: sheldonh

Reflect reality:
- Make world doesn't build the modules any more.
- Mention the buildkernel/installkernel targets as common used targets.
- LINT has gone, NOTES is new but cannot be built. It is a pure reference
file. However, I still mentioned LINT but pointed out the difference
between the ancient LINT and the new NOTES. This should avoid confusion.
- crypto/ subdir isn't export controlled any more.

$Id$ -> $FreeBSD$

No more src/lkm dir...

Correct the facts. The kerberosIV/ directory is not export restricted.

Re-alphabetize and update the subdir descriptions.

PR: 7116

Note that /etc is not installed by world target either.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Typo (maybe), config(1) -> config(8).

Bring back the README, this time attempting to be a little more
informative about what the user is seeing here.