[PythonCAD] DWG Reader for R12 file format

[Art Haas]

Hi.

I've just finished a reader for the R12 file format. It operates the
same way as the R13/R14 file reader. I have one R12 DWG file and it
reads this file without generating an error. I'd like this to get
tested in the same way as the R13/R14 reader. Please mail me if you can
test this out.

The file format info was found by searcing on the Internet, not the
OpenDWG people. Searching on Google lead to info from Frans Faase and
Reini Urban and some work they had done in decoding the format. The
decoding doesn't appear to be as complete as the OpenDWG people
produced, but it looks like there is enough to get the info out of the
file. I'd welcome links to more indepth info if it is available.

Again, let me know if you can try this out.

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