[PythonCAD] First hack at DWG reading

[Art Haas]

I should have listed the OpenDWG site in the earlier mail ...

http://www.opendwg.org

Also the following site was _very_ helpful in providing some C code that
reads the DWG files. The code does have some bugs in it, and it doesn't
always match what the spec says but it generates output that is sensible
and useful to compare the output of the dwg.py script.

http://www.geocities.com/kuyunjik

Art
-- 
Man once surrendering his reason, has no remaining guard against absurdities
the most monstrous, and like a ship without rudder, is the sport of every wind.

-Thomas Jefferson to James Smith, 1822