dot.profile: add commented out LESS example

Switch commented out PAGER from more(1), the default, to less(1), so
that a user can just uncomment the line and doesn't have to edit it.

While here, add commented out example of setting less(1) options with
LESS and explain how you can use -X to alleviate the pain from
alternate screen switching (b/c, of course, nothing is more user
friendly than wiping away from the screen the manual page you have
just been reading in your PAGER and want to peek at again as you are
typing the command).

dot.profile: reword the comment about EDITOR

Push the scary cool story about ed(1) from the front page. The user
is more interested in the options available to them, so move the
sentence about emacs and nano closer to the beginning of the comment.

TBH, I was a bit incredulous, but sh's own fc _does_ use ed if EDITOR
is not set, though it seems to be the only program in base to do this.
Speak of a self-fulfilling prophecy...

branches: 1.10.16;
/usr/X11R6 has been empty on most NetBSD installations since 2008,
and the last few straggling ports dumped it in 2015. It's time to
prune references to /usr/X11R6 from our config files.

branches: 1.9.26;
fix use of setenv in a comment, noted by "stu314" on freenode.

branches: 1.8.2; 1.8.4;
put back a commented out EXINIT entry.

Re-enable EDITOR=vi because otherwise stuff breaks. (Or runs ed, which
is arguably equivalent to breaking.)

Per the discussion on tech-userlevel, document the settings offered.

(All of this needs quite a bit more work still.)

Cleanup ancient entries derived from 4.4BSD Lite2 merge
for newer useradd(8) users:
- remove all aliases
- remove annoying EXINIT setting
- comment out other environment settings

Discussed on tech-userlevel@.

Sprinkle /usr/X11R7 where relevant. rc.d/x{fs,dm} are left to be done.

branches: 1.4.18; 1.4.26;
Sync behaviour of sh and ksh dotfiles for new users with those of root.
Addresses PR 32215 by Wouter Schoot

branches: 1.3.12;
Add more descriptive header comments for default dotfiles.
Text based on suggestions by Igor Sobrado in PR misc/21223

Nuke 'umask 2' as it is inappropriate for the default useradd(8)
behaviour. The system default (022) is more sensible.

branches: 1.1.2; 1.1.4; 1.1.6;
Copy skel files from sharesrc/share/skel.

Part of fix for PR bin/10985.