Add PY_EXTRA_FLAGS to build-and-test-py-project.sh

    echo "TESTABLES: $TESTABLES"

    ulimit -c unlimited

    # Need to set both _TEST and _CTX because doctests do not use _TEST.

    ${PY_EXE} -m pytest -rw --durations=10 --tb=native  --junitxml=pytest.xml -rxsw $TESTABLES

    # PY_EXTRA_FLAGS can be used to pass -m mpi4py.run

    # https://mpi4py.readthedocs.io/en/stable/mpi4py.run.html

    ${PY_EXE} ${PY_EXTRA_FLAGS} -m pytest -rw --durations=10 --tb=native  --junitxml=pytest.xml -rxsw $TESTABLES

  fi

fi