Remove $FreeBSD$: two-line .h pattern

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

getconf(1): add DEALLOC_PRESENT

Allow getconf to query _PC_DEALLOC_PRESENT pathconf(2) variable
added in 0dc332bff200.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D39796

Add an -a flag to getconf.

When -a is specified, the name and value of all system or path
configuration values is reported to standard output.

Reviewed by: kib (earlier version)
MFC after: 1 week
Sponsored by: Chelsio Communications
Differential Revision: https://reviews.freebsd.org/D12373

Revert crap accidentally committed

Revert r312923 a better approach will be taken later

Add non-TRUSTEDBSD prefixed knobs for the _PC_ACL* and {CAP,INF,MAC}_PRESENT knobs

It's not necessarily intuitive that the variables to query contain TRUSTEDBSD
in the prefix. Add non-TRUSTEDBSD prefixed knobs for querying things like
"_PC_ACL_NFS4".

MFC after: 1 week
Relnotes: yes
Reviewed by: wollman
Sponsored by: EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D7618

Add support for _PC_ACL_NFS4 as TRUSTEDBSD_ACL_NFS4

The TRUSTEDBSD prefix was chosen for consistency with the other
related `_PC_ACL*` prefixed variables.

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

Add `MIN_HOLE_SIZE` pathconf(2) support to getconf

This allows shell programs to programmatically determine whether
or not a filesystem supports sparse files

MFC after: 3 days
Sponsored by: EMC / Isilon Storage Division

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.

Warns fixes. Mainly unused headers/params/vars removal, but also
some malloc cleanup.

Add new 1003.1-2001/TC1/D6 parameters. (On final recirculation ballot now,
so this should be officially TC1 before the New Year.)

Add TrustedBSD pathconf parameters.

Add compilation support for -stable (to be merged momentarily).

Completely revamp the way getconf(1) works, for better adherence to the
intent of the Standard.

- Make getconf able to distinguish between configuration variables which
are entirely unknown and those which are merely not defined in the
compilation environment. The latter now get a more appropriate
"undefined\n" result rather than a diagnostic. This may not be
exactly right, but it's closer to the intent of the Standard than
the previous behavior.

- Support ``programming environments'' by validating that the environment
requested with the `-v' flag is the one-and-only execution environment.
(If more environments are supported for some platforms in the future,
multiple getconf(1) executables will be required, but a simple edit in
progenv.gperf will enable automatic support for it.) Document POSIX
standard programming environments.

- Add all of the 1003.1-2001 configuration variables. FreeBSD does not
support all of these (including some that are mandatory); getconf will
later be fixed to break the world should a required variable not be
defined.

As a result of all these changes, gperf is no longer adequate. Keep the
overall format and names of the files for now, to preserve revision history.
Use an awk script to process the .gperf files into C source, which does a
few things that gperf, as a more general tool, cannot do. The keyword
recognition function is no longer a perfect hash function.

This may obviate the need for gperf in the source tree.

- Add a small compile-time regression test to break the build if any of the
.gperf files declare conflicting token sets. (gperf itself would have done
this for the simple case of duplicate tokens in the same input file.)

Hello, getconf. This is a slight reinvention of the
wheel^H^H^H^H^HPOSIX.2 and X/Open utility, and rather
more complicated than necessary.