wumpus

Copperbox revision 2237.

I've changed the representation of "safe" / loadable fonts. This means Wumpus-Basic no longer needs the GhostScript font map, instead the "Safe Fonts" module - now called StandardFontDefs - resolves the GhostScript file names. If the font name mapping is wrong for a alternative version of GhostScript (Wumpus is developed with 8.54) a different module to StandardFontDefs can be defined and imported instead.