corrected the concept-check in AnalyticGridFunction order function

src/amdis/gridfunctions/AnalyticGridFunction.hpp

@@ -80,7 +80,7 @@ namespace AMDiS
    * - The functor `F` must fulfill the concept \ref Concepts::HasOrder
    **/
   template <class Sig, class LocalContext, class F,
-    REQUIRES(Concepts::HasOrder<F>)>
+    REQUIRES(Concepts::HasFunctorOrder<F,1>)>
   int order(AnalyticLocalFunction<Sig,LocalContext,F> const& lf)
   {
     return order(lf.fct(),1);