message: Made DDI unit test more general:
  added a lattice_constant of 2.77 instead of 1.0
diff: @@ -62,7 +62,7 @@ n_interaction_pairs 0
  ################### Geometry #####################
  ### Lattice constant for basis and translations
  -lattice_constant 1.0
  +lattice_constant 2.77
  ### The bravais lattice type
  bravais_lattice hex2d
  