script reformatted / scaling, positioning, units fixed

Hey Martin

I've tested your exporter script for using it with the Lasersaur, and it's seems to be very useful! (Since UV unwrapping never works in the right scale...)

But I got some troubles with an error message showing up in Blender, when exporting the SVG... (something about line 103).

It seemed to be a problem with the formatting (missing tab in Pyhton) I think... Then I've tested it, and needed to change the scaling (curve.dimensions...) and tried to export it directly in millimeters... Hope it works!

What would be great too: switching the Inkscape document directly to mm units...

  < sodipodi:namedview
.......
     units="mm"
     inkscape:document-units="mm" />

But that's is for later, need some sleep ;)

-a