[Open-graphics] OGA1 Spartan3

[Kenneth Ostby]

André Pouliot:
>There was some change made to the file in the repository. Because of
>those change now the Spartan 3 part of the design can pass synthesis. It
>will also solve some of the problem encountered by those trying to
>simulate that part.

And now the XP10 passes synthesis as well. I would like to have a 2nd
pair of eyes on some of the fixes though. I've marked some TODOs in the 
xp10_top_level.v if people wants to check if I wired it up correctly.


-- 
Life on the earth might be expensive, but it 
includes an annual free trip around the sun.

Kenneth Østby
http://langly.org