Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

lib: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified 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.

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

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

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

Major cleanup:

- add __unused where appropriate
- PAM_RETURN -> return since OpenPAM already logs the return value.
- make PAM_LOG use openpam_log()
- make PAM_VERBOSE_ERROR use openpam_get_option() and check flags
for PAM_SILENT
- remove dummy functions since OpenPAM handles missing service
functions
- fix various warnings

Sponsored by: DARPA, NAI Labs

Rename the even_root option to allow_root.

Sponsored by: DARPA, NAI Labs

Aggressive cleanup of warnings + authtok-related code in preparation for
PAMifying passwd(1).

Sponsored by: DARPA, NAI Labs.

NAI DBA update.

#include cleanup.

Sponsored by: DARPA, NAI Labs

WARNS=4 fixes. Protect with NO_WERROR for the modules that have
warnings that are hard to fix or that I've been asked to leave alone.

Don't let root through unless the "even_root" option was specified.

Sponsored by: DARPA, NAI Labs

Base the comparison on UIDs, not on user names.

Sponsored by: DARPA, NAI Labs

Add a pam_self authentication module that succeeds if and only if the local
and remote user names are the same.

Sponsored by: DARPA, NAI Labs