Add construction call.

dune/fufem/estimators/refinementindicator.hh

@@ -118,4 +118,9 @@ value (const Element& element, unsigned int codim, unsigned int subEntity) const
     return (indicatorEntry != indicators_[codim].end()) ? indicatorEntry->second : 0;
 }
 
+template <class Grid>
+auto makeRefinementIndicator(const Grid& grid) {
+  return RefinementIndicator<Grid>(grid);
+}
+
 #endif