Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Shift+Ins - paste buffer
Shift+PrintScr - prev. screen

Add FreeBSD ID tags while I'm here, since people often copy an exiting
keyboard map and then edit that and try to commit it.

Remove one tab from us.iso.kbd so that it now has no tabs in it. This
is likely the intent of the original author since no other places use
tabs.

Sync us.unix.kdb to us.iso.kbd. It should now only swap ESC and `~,
bs and delete, control and caps lock and make no other changes from
us.iso.kdb.

The control code ^_ (0x1f) should really be called `us' rather than `ns'.

fkey61 is the same thing as del, kinda. Make sure that we really swap del and
bs.

Reported by: Chuck Robey

Add us.unix.kbd. Just like us.iso.kbd except:
ESCAPE and `~ are swapped
CTRL and CAPS LOCK are swapped
BACKSPACE and DELETE are swapped

Suitable for keymap=us.unix in your rc.conf file or for setting on the
fly with kbdcontrol -l us.unix. This is the keyboard layout of many of
the more traditional unix workstations and terminals that have been around
for a very long time. Older Sun keyboards and VT100's had a layout
very similar to the PC, with the above exceptions.
Idea Reviewed by: Many people in -hackers