sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

sys/sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Convert files to UTF-8

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

* Add CDRIOC{READ,WRITE}SPEED ioctls to cd(4). Units are in KB/sec.
* Change atapi-cd ioctls to use the same units.
* Change burncd, cdcontrol to convert CDROM speed to KB/sec before
calling the ioctl. Add a "max" speed option for their command lines.

This change does not break ABI but does change the units passed through
the ioctl so 3rd party software that uses cdrio.h will have to convert
(most likely by multiplying CDROM speed by 177 to get KB/s).

PR: kern/36845
Submitted by: Philipp Mergenthaler <p@i609a.hadiko.de> (CAM ioctls)
Reviewed by: sos, ken
MFC after: 1 month

Add DVD+RW support to the ATA driver and burncd. This also closes
PR40430 by "Peter Haight <peterh@sapros.com>" that has semilar patches
included and which I merged with my own work.

HW sponsored by: FreeBSD Foundation & FreeBSD Mall Inc

Enjoy!

Update header.

Add entries to allow setting the CD type on cue sheets

Add test_write element.

Add new ioctl's and rearrange a bit for DAO mode support.

Add session argument to *CLOSEDISK, allowing to set session type on fixate.
Add defines for the different blank/erase types.

Add CDR progress ioctl.

New ATAPI burner utility. Replaces wormcontrol.