A DXF backend was added. The output is in the drawing interchange format used by computer aided design software. Thanks to Jonas Benedett Dorr for testing. The Gimppath backend was changed to be compatible with current versions of Gimp. The EPS, PDF, and SVG backends now use high-resolution bounding boxes. The default scaling of the EPS, PDF, and SVG backends is now fixed at 72dpi. A new option --flat was added to the SVG backend. A new option --tight was added to remove whitespace around the input image before calculating its scaling and placement.