Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Import of liblzma, xz, xzdec, lzmainfo from vendor branch
Add support for xz and lzma to lesspipe.sh (xzless, lzless)
Bump __FreeBSD_version

Approved by: delphij (mentor)
MFC after: 2 weeks

Update less to v436. This is considered as a bugfix release from vendor.

Major changes from v429:
* Don't pass "-" to non-pipe LESSOPEN unless it starts with "-".
* Allow a fraction as the argument to the -# (--shift) option.
* Fix highlight bug when underlined/overstruck text matches at end of line.
* Fix non-regex searches with ctrl-R.

Approved by: re (kensmith, kib)

Correct the script name to be "zless.sh". This avoids an extra cp/chmod
(from the sys.mk rule) while still installing it under the "zless" name.

Add a zless script which invokes less using the lesspipe script. This is
similar to the zmore script that comes with gzip (and in fact, in most
Linux distros, zless is a symlink to that very same zmore script) but has
the advantage that you get the correct file name on the less status line,
and can use :n and :p to navigate back and forth between multiple files.

MFC after: 1 week

Add an embellished lesspipe.sh as described in the man page.
P.S. it is stupid I have to define both SCRIPTS and SCRIPTSNAME.

Use ${BINDIR} instead of hardcoded path.

PR: 44582
Submitted by: Jon Disnard <jon.disnard@ca.com>
Reviewed by: ru
MFC after: 3 weeks

MAN[1-9] -> MAN.

ncurses -> termcap

Fixed some style bugs. Apart from formatting bugs, MANDEPEND is deprecated
and $< and $@ are even documented as deprecated.

Install a manpage for more.

Detach usr.bin/more and install a link from less. less will behave
like more if invoked as more. The old more has not been removed.

bmake glue for less.

Reviewed by: peter