wumpus-core

Copperbox revision 1884.

First round of work making moving Primitives a cheap operation. This is very useful to Wumpus-Basic so it can arrange BoundedGraphics where it needs to take a bounding box but then draw the Prim somewhere else.

This work changes the internal representation of Paths to use relative path segments rather than absolute ones. With relative path segments the function to move paths can just move the start point. A second round of work will have to look at the PrimGroup Primitive constructor - currently transforming this maps the transform to all its elements, maybe it ought to "cache" transformations in a CTM.

Note - I've found a bug in calculating the bounding box of rotated ellipses, I'm not sure how long this has been around...