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

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

Oops, r215291 (over 2 years ago) forgot to remove mention of "medium" from the
F1 Help file. Direct commit to stable/9 (no sysinstall in head).

Oops, r186202 (over 4 years ago) forgot to remove Tape from the F1 Help file.
Direct commit to stable/9 (no sysinstall in head).

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

Approved by: re (implicit)

Fix a couple of typos.

PR: docs/148891
Submitted by: olgeni
MFC after: 1 week

Set magic fbsd:nokeywords property that allows files to bypass
keyword expansion. (file-specific replacement for CVSROOT/exclude)

Fix a number of documentation-lags-behind-reality bugs in sysinstall(8).
While here, fix a couple of comments too.

Submitted by: Oliver Fromme <olli -at- lurza.secnetix.de>
Approved by: re (kensmith)

Bring these files somewhat into the present.
Perform some rewording while here.

Remove register.hlp, since the code that deals with it was removed
nearly 7 years ago.

Switch from lynx to "links" as the default doc browser.

Submitted by: jim

Fix some spelling errors.

Jordan, I'll let you merge this into 2.2o that I don't
stomp on you.

Update docs to match.

Update the documentation here and there.

Don't use some of the low-contrast text attributes I was using before - they
apparently look bad on some LCD screens. While I'm in there, tweak and adjust
a number of other minor interface details which have been bothering me for
awhile.

These docs were in fair need of updating.

Update the -current sources from the 2.1 branch.

Approved (in spirit) by: jkh

This mega-commit brings in Jordan's latest sysinstall version..
This looks like it was developed offline, and is being spammed over the
top of the existing. "That's fine by me! I dont really care how you do
it, just get it in there..." said Jordan in a conversation a short while
ago...