Update tV_model.ipynb: remove link to feature branch of the ALF code (it has been merged to the master)

Resolve "Create a Run directory"

Closes #10

See merge request !7

Update projective notebook, removing tutorial headers (that belong in the tutorial, not in the notebooks) and making a few other changes.

Update notebooks, removing tutorial headers (that belong in the tutorial, not in the notebooks) and making a few other changes.

Organizational: putting the notebooks in their own directory - for now just copying them there, since one has to do ` export PYTHONPATH="/local/path/to/pyALF:$PYTHONPATH"  `, so that is a change which we should discuss first.