Specify all dependencies needed to run the dwarfs example

[blsqr]

When following the instructions in the README (in a a fresh venv), the following dependencies are missing when trying to run run_seven_dwarfs.py:

• h5py
• networkx
• matplotlib
• plotly

This PR adds them to setup.py and updates the basic metadata supplied there (using already available information from the GitHub repo).

The former two dependencies seem to be required within pycopancore while the latter two are only used from the scripts defined in studies. Thus, the latter two shouldn't actually be part of setup.py...
Depending on how you would want to resolve this, I'm happy to add another commit which:

• removes matplotlib and plotly from the dependency list
• adds a note to the README that these additional packages need to be installed