add term files for xterm-88color and xterm-256color

[Dan Nicolaescu <dann@ics.uci.edu>]

One of the recommended ways to use the 88 or 256 color support in
xterm is to set the TERM environment variable to xterm-88color or
xterm-256color. Emacs cannot cope with this because it does not have
the corresponding term files. term/xterm.el can deal with everything
needed, it just needs to be loaded.

Can somebody please check this in if it's OK? (I don't have write access)

Thanks.

2004-09-02  Dan Nicolaescu  <dann@ics.uci.edu>

	* xterm-88color.el: 
	* xterm-256color.el: New files.

--- /dev/null	2004-02-23 13:02:56.000000000 -0800
+++ xterm-88color.el	2004-09-02 11:32:41.583831309 -0700
@@ -0,0 +1,3 @@
+;; -*- no-byte-compile: t -*-
+
+(load "term/xterm")
--- /dev/null	2004-02-23 13:02:56.000000000 -0800
+++ xterm-256color.el	2004-09-02 11:32:41.582831579 -0700
@@ -0,0 +1,3 @@
+;; -*- no-byte-compile: t -*-
+
+(load "term/xterm")