wumpus-basic

Copperbox revision 1597.

I've changed the AGraphic type so that nodes and connectors are more uniform (there is no longer the AGraphic2 type).

I'll probably change the AGraphic type again with the next commit. It looks like embedding a modify function for DrawingAttr within the type is not going to be workable. Changing this will be no bad thing, the AGraphic type will then be more like the 'dual representation' types of Haven and Kansas Lava.