test_bellmannx.py failing

`Traceback (most recent call last):
  File "test_bellmannx.py", line 10, in <module>
    from ..utils import wss_add_market, wss_update_graph
ImportError: attempted relative import with no known parent package`

Much of the project seems to be not working, on my part. It was fine a year ago.

Ubuntu 18, Python 3.7.5