Merge branch 'issue/analytic_gridfunction_conceptcheck' into 'develop'

corrected the concept-check in AnalyticGridFunction order function

See merge request spraetor/dune-amdis!58

src/amdis/gridfunctions/AnalyticGridFunction.hpp

@@ -77,10 +77,10 @@ namespace AMDiS
    * requires a free function `order(fct,1)` to exists.
    *
    * **Requirements:**
-   * - The functor `F` must fulfill the concept \ref Concepts::HasOrder
+   * - The functor `F` must fulfill the concept \ref Concepts::HasFunctorOrder
    **/
   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);