The pyVO course as usual requires Markus' crazy slide-tools, avaliable
from ssh://pubgit@sosa.tfiu.de/~/slide-tools (contact
msdemlei@ari.uni-heidelberg.de for access; sorry 'bout that).

In addition, we now have notebooks. These are a huge pain with version
control, and the least we should do is remove the outputs.  To do that,
there's the script remove_ipynb_outputs.py, which needs the python3-nbformat
package.

To make this work in a halfway automated fashion given that svn doesn't
have client-side hooks, I've written a commit-here script that does the
necessary motions.  Lame, but that's all I can up with.  Notebooks are
lame.