add getter for the material parameters

[[Imported from SVN: r11899]]

dune/elasticity/materials/geomexactstvenantkirchhoffmaterial.hh

@@ -49,7 +49,14 @@ public:
         nu_(nu)
     {}
 
-    void setMaterialParameter(ctype E, ctype nu)
+    void getMaterialParameters(ctype& E, ctype& nu)
+    {
+        E = E_;
+        nu = nu_;
+    }
+
+
+    void setMaterialParameters(ctype E, ctype nu)
     {
         E_ = E;
         nu_ = nu;