wumpus-core

Copperbox revision 1623.

More tidying up of the SVG output code. I might now be in a position to look at reworking the coordinate transformation code for SVG.

SVG uses top-left as the origin whereas Wumpus and PostScript use bottom-right. In the SVG output I use an initial matrix transformation [1 0 0 -1 0 0] to change the orientation, then for text-labels I do an inverse transformation (otherwise they are displayed upside down).

I'm not sure how expensive this is for the renderer, but translating the coordinates at the generation stage will always be more efficient even if only slightly.