Wumpus

Copperbox revision 899.

I've sorted out the coordinate changes for SVG including text which was previously upside down. Now SVG output and PostScript output should pretty much match.

Next up, I'm going to divide Wumpus into to cabal packages - one for Wumpus.Core which hopefully won't change much from now on; and the other for Wumpus.Extras and Wumpus.Geometry. This will probably mean Subversion commit numbers go a bit mad as I shift directory contents about.