Various improvements in svg import: Viewbox center alignment with world origin
The viewBox attribute defines the position and dimension, in user space, of an SVG viewport. So it will be better, if blender uses this value instead 'document_height' and only in inkscape-generated files.
Center of imported svg are in document center:
Updated version / 2.79 / file in inkscape;
Old code is wrong, because document height and element sizes are in different units!