wumpus

Copperbox revision 1708.

I've changed the Z-Order of trace in the drawing monad - the first expression in a do-block is drawn on top. This is how previously worked in Wumpus-Basic, although it is an arbitrary decision. Ideally there should be some control over layers in the Drawing monad.

Also I've renamed the primitive dots to be marks - marks are dots that are just drawn and don't have anchor handles.

Finally there are some sundry cabal file and Haddock doc changes; I'll probably make a release of the current code.