message: modified import in test to get consistent with gudhi.wasserstein.barycenter
diff: -from gudhi.barycenter import lagrangian_barycenter
  +from gudhi.wasserstein.barycenter import lagrangian_barycenter
  import numpy as np
  """ This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
  