working openGL CDT demo

[Seth Teller <teller@lcs.mit.edu>]

BMG students (sean & jason especially), check out:

  http://city.lcs.mit.edu/bmg/

for the file cdt.tar -- it's a revised version of CDT,
along with a demo that shows how to create a CDT, 
insert points, and use openGL callbacks to display it.
use the mouse button to add points once the window
comes up.

it seems we have multiple versions of CDT around;
jason, can you look through these and determine
which is the latest and greatest?  that, plus the
demo code, is what should be checked into CVS.

thx,

prof. t.