This is related to pkgbase as it uses CONFS to properly tag these as config
files.

Approved by:	will (mentor)
Differential Revision:	https://reviews.freebsd.org/D16785

- duplicate words
- typos
- references to old versions of FreeBSD

Reviewed by:	imp, benno

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.

No functional change intended.

Sponsored by:	Dell EMC Isilon

- Note existence of -m option.
- Note that -s applies to rule keyword, only, by adding usage text
  specifically for the `rule` and `ruleset` keywords.

Don't go into any further detail in usage(..) -- it's best that one
reads the manpage to get a better idea of how things work as there are
a number of different option-specific keywords and arguments, as well
as some rule grammar.

MFC after:	1 week
Sponsored by:	Dell EMC Isilon

Move sentence to a new line as advised by igor.

PR:		212441
Approved by:	bcr (mentor)
MFC after:	5 days
Differential Revision:	https://reviews.freebsd.org/D8104

Sponsored by:	The FreeBSD Foundation

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp