Image export

Hi Piotr,

thanks for the suggestions.

  1. I confirm, without the ----- separation lines the pdf via latex is well produced - however still withouth images.
  2. The display/output of images works fine with markdown cells in the Jupyter notebook. The proposed solution will display the images in an awkward sub-window in the Jupyter notebook, while still not including them in the pdf export. (independent if I use the SWAN export or the command line jupyter nbconvert). Downloading a html export to the same folder however does correctly reference and display the images in the html page.