working on docs

would be cool to  make graphics all svg's and convert the to
png's for html and pdf's for latex output, this is described
https://sites.google.com/site/nickfolse/home/sphinx-latexpdf-output-with-svg-images

uuuhttps://sites.google.com/site/nickfolse/home/sphinx-latexpdf-output-with-svg-images#	modified:   source/examples/oneport_calibration.rst
https://sites.google.com/site/nickfolse/home/sphinx-latexpdf-output-with-svg-images