message: remove warning messages
diff: @@ -217,10 +217,6 @@ namespace RINGMesh {
  index_t possibly_existing_relationship_id = find_boundary_relationship(
  in_boundary, boundary );
  if( possibly_existing_relationship_id != NO_ID ) {
  - Logger::warn( "Relationship",
  - "The relation between the in boundary ", in_boundary,
  - " and the boundary ", boundary,
  - " already exists. Nothing is done" );
  return possibly_existing_relationship_id;
  } else {
  index_t relationship_id =
  @@ -280,9 +276,6 @@ namespace RINGMesh {
  index_t possibly_existing_relationship_id =
  find_parent_child_relationship( parent, child );
  if( possibly_existing_relationship_id != NO_ID ) {
  - Logger::warn( "Relationship", "The relation between the parent ",
  - parent, " and the child ", child,
  - " already exists. Nothing is done" );
  return possibly_existing_relationship_id;
  } else {
  index_t relationship_id =
  