wumpus-core

Copperbox revision 2170.

I've changed the internal representation of primitive Paths so they store transformation information in a CTM like Text and Ellipse.

Work on unit changing has uncovered a very strange translation bug that I haven't been able to get to the bottom of - Paths are being displaced by far more than the unit change, Text and Ellipses are okay. As I can't work out out what's going on, the best thing to do is to unify the representation of primitives, hoping that either the bug will disappear as a consequence, or it becomes easier to identify.