wumpus-basic

Copperbox revision 1701.

I've reorganized the file names of the Basic.Graphic modules now that the code has solidified a bit. Also I've deleted some of the files that had become redundant - particularly the monad modules for Tracing and DrawingCtx, they are superseded by Graphic.Drawing.

Quite a few of the examples are currently broken because of these file changes, they will be updated in due course.