Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

ddb: Rework macros to make it easier to add new command tables.

- Add new DB_DEFINE_TABLE and DB_DECLARE_TABLE macros to define new
command tables. DB_DECLARE_TABLE is intended for use in headers
similar to MALLOC_DECLARE and SYSCTL_DECL.

DB_DEFINE_TABLE takes three arguments, the name of the parent table,
the command name, and the name of the table itself, e.g.
DB_DEFINE_TABLE(show, foo, show_foo) defines a new "show foo" table.

- DB_TABLE_COMMAND, DB_TABLE_COMMAND_FLAGS, DB_TABLE_ALIAS, and
DB_ALIAS_FLAGS allow new commands and aliases to be defined. These
are similar to the existing DB_COMMAND, etc. except that they take
an initial argument giving the name of the parent table, e.g.:

DB_TABLE_COMMAND(show_foo, bar, db_show_foo_bar)

defines a new "show foo bar" command.

This provides a cleaner interface than the ad-hoc use of internal
macros like _DB_SET that was required previously (e.g. in cxgbe(4)).

This retires DB_FUNC macro as well as the internal _DB_FUNC macro.

Reviewed by: melifaro, kib, markj
Differential Revision: https://reviews.freebsd.org/D40819

DB_COMMAND(9): fix a typo

Fixes: b83d53cb687e

DB_COMMAND(9): update to mention additional macros

Document the existing alias definitions, and augment the example with
one of these. Also, describe the purpose of the newly added _FLAGS
variations of these command definitions.

Make some small style improvements to appease mandoc -Tlint.

Reviewed by: markj
MFC after: 3 days
Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D35664

DB_COMMAND(9): fix mandoc markup

Start new sentences on new lines.

MFC after: 1 week
Reported by: make manlint
Sponsored by: Dell EMC Isilon

Fix various mdoc issues and some EOL whitespace.

Found with: mandoc -Tlint

use .Mt to mark up email addresses consistently (part6)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Typo and mdoc(7) style fixes.

PR: 168117
Submitted by: Nobuyuki Koganemaru (kogane&jp!freebsd!org)
MFC after: 3 days

Set formatting width and offset in DB_COMMAND(9).

Remove trailing whitespace per mdoc lint warning

Disussed with: gavin
No objection from: doc
Approved by: joel
MFC after: 3 days

Remove superfluous paragraph macro.

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

mdoc: drop redundant .Pp and .LP calls

They have no effect when coming in pairs, or before .Bl/.Bd

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.

decription of macros to add ddb commands

Submitted by: Guillaume Ballet <gballet@gmail.com>
MFC after: 1 month