Fix the Jupyter notebooks when they run on Binder.

Bernd Flemischrequested to merge
fix/jupyter-on-binder into master

Currently, using matplotlib on binder with usetex=True results in an error, see https://github.com/jupyterhub/binder/issues/211. Therefore, reset usetex=False in all notebooks and replace the Latex underscores "_" with standard ones "_".

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