Bug#880120: implement SHIFT+END

[積丹尼 Dan Jacobson <jidanni@jidanni.org>]

X-Debbugs-CC: dickey@invisible-island.net
Package: xterm
Version: 330-1

When I press SHIFT+PAGE_UP, SHIFT+PAGE_DOWN,
everything works out fine.
But SHIFT+END just beeps and leaves some residue letters "2F" on the
screen.
It should act like I hit lots of SHIFT+PAGE_DOWN.