Inserted grid width calculation for some tests.

[[Imported from SVN: r723]]

grid/albertgrid.hh

@@ -550,6 +550,10 @@ namespace Dune
     //! return the global unique index in grid , same as el_index
     int global_index();
 
+    albertCtype maxEdgeWidth ();
+
+    albertCtype diam();
+
   private:
     // called from HierarchicIterator, because only this
     // class changes the level of the entity, otherwise level is set by
@@ -1149,6 +1153,10 @@ namespace Dune
 
     //! transform grid N = scalar * x + trans
     void setNewCoords(const Vec<dimworld,albertCtype> & trans, const albertCtype scalar);
+
+    //! calculate max edge length
+    double calcGridWidth ();
+
   private:
     // initialize of some members
     void initGrid(int proc);