Wumpus

Copperbox revision 944.

Minor but useful work on dots. Its induced a couple of useful extra operations for Wumpus.Core.AffineTrans and clarified somewhat a useful construction mechanism - i.e. if we can do any affine transformations on the components of dots (points, line segments) before we assemble them into Wumpus Pictures, then the calculations are done in advance rather then transmitted to PostScript inside gsave ... grestore blocks.