wumpus-core-0.4.0, wumpus-extra-0.1.0

Copperbox revision 902.

The examples in wumpus-core and wumpus-extra working are again, so I've made release archives of both these packages. I've let wumpus-core inherit the version number from Wumpus before the package split, otherwise I wouldn't feel like I was making progress.

Copperbox revision 903.

I've deleted the original Wumpus directory tree, now that Wumpus is split into wumpus-core and wumpus-extra.