Remove dependency to nnutils
Refs: https://redmine.teklia.com/issues/2444
The nnutils library is no longer maintained and is only compatible with Python 3.6, 3.7, 3.8. We should remove PyLaia's dependency on nnutils.
Refs: https://redmine.teklia.com/issues/2444
The nnutils library is no longer maintained and is only compatible with Python 3.6, 3.7, 3.8. We should remove PyLaia's dependency on nnutils.