wumpus

Copperbox revision 1683.

Minor updates to get the released libraries (Tree and Microprint) compiling with the latest updates to Core and Basic.

I'll probably make a new release tomorrow, though in some ways its a pity I put Tree, Microprint and Basic on Hackage as they are so rough and updates usually don't add anything; but if I hadn't uploaded them I wouldn't have improved Core (and if I only update Core on Hackage the other projects will be broken). Hopefully, the current Core will now be fairly stable and I can concentrate on redesigning Basic.