Need to make use of the ompy submodule

[fzeiser]

Need to make use of the ompy submodule: Currently the notebook will simply run the ompy version installed. Should make sure to use the submodule instead. However, with the current settings I get an import error:

    except ImportError:
        msg = """Error importing ompy: you should not try to import ompy from
        its source directory; please exit the ompy source tree, and relaunch
        your python interpreter from there."""

Solutions:

• delete that part from ompy, or
• define an environment variable ompy_allow_importSource which allows import from source. Then we also need to make sure that the cython modules have been build.