message: fix compilling issu
diff: @@ -60,7 +60,7 @@ namespace {
  public:
  GeoModelMeshPolygonsBaseSort(
  const SurfaceMesh< DIMENSION >& mesh,
  - const GEO::Attribute< index_t >& surface_id )
  + const std::vector< index_t >& surface_id )
  : mesh_( mesh ), surface_id_( surface_id )
  {
  }
  @@ -76,7 +76,7 @@ namespace {
  }
  private:
  const SurfaceMesh< DIMENSION >& mesh_;
  - const GEO::Attribute< index_t >& surface_id_;
  + const std::vector< index_t >& surface_id_;
  };
  template< index_t DIMENSION >
  