Remove $FreeBSD$: two-line nroff pattern

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

Add a "live" mode to ktrdump.

Support a "live" mode in ktrdump enabled via the -l flag. In this
mode, ktrdump polls the kernel's trace buffer periodically (currently
hardcoded as a 50 millisecond interval) and dumps any newly added
entries. Fancier logic for the timeout (e.g. a command line option or
some kind of backoff based on the time since the last entry) can be
added later as the need arises.

While here, fix some bugs from when this was Capsicum-ized:
- Use caph_limit_stream() for the output stream so that isatty() works
and the output can be line-buffered (especially useful for live
mode).
- Use caph_limit_stderr() to permit error messages to be displayed if
an error occurs after cap_enter().

Reviewed by: kib, 0mp (manpage)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D17315

Change ktrdump to use the more standard -M/-N flags to specify the path
to a crash dump and kernel, respectively. The existing -m/-e flags are
still supported for backwards compatiblity but are no longer documented.

Requested by: np
MFC after: 2 weeks

use .Mt to mark up email addresses consistently (part3)

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

Add -H flag to print thread id.

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.

Markup and wording fixes.

Approved by: re (blanket)

Document the '-i' option which allows the user to specify a ktr events
log file.

mdoc(7) fixes.

Add a "-r" flag to ktrdump(1) to print relative timestamps when used
with "-t" rather than absolute timestamps. This allows the reader
to get a better sense of latency between events, such as time to
schedule an interrupt thread from time the interrupt occurred. Assert
a copyright on ktrdump.c since I seem to be modifying it more than I
thought.

Add a quiet mode to ktrdump(1): if the "-q" flag is used, don't print
the pretty text header on top of the output. Simplifies feeding the
results of tracing into a script for mechanical processing.

The .Nm utility

mdoc(7) police: fixed typo, minor markup nits.

Add a man page.

Submitted by: davidc