wumpus

Copperbox revision 2545.

I've changed the implementation of LocDrawing so that the run function uses translation, rather than monadically thread an immutable start point (Reader). Trying to thread a start point was tying me up in semantic knots - a rethink was necessary.

This has got simple radial connector tree drawing working again (last commit it compiled but ran with a bug). The other connectors need re-implementing.