rewritten mesh creator to support more general creation

Automatically create dune grids by different strategies.

1. If a macro file name is given, try to determine by file extension which reader to use and read the grid from file
2. else if the parameter mesh->structured is given, try to construct a structured grid
3. else try to create the grid depending on the grid type

src/amdis/BoundaryManager.hpp

@@ -154,6 +154,13 @@ namespace AMDiS
       }
     }
 
+    template <class I>
+    void setBoundaryIds(std::vector<I> const& ids)
+    {
+      test_exit(ids.size() == boundaryIds_.size(), "Number of boundary IDs does not match!");
+      std::copy(ids.begin(), ids.end(), boundaryIds_.begin());
+    }
+
   private:
     std::shared_ptr<Grid> grid_;
     using Super::boundaryIds_;