Deprecate TypeTraits::PointeeType and TypeTraits::ReferredType

Because C++11 implements this differently, and we now have an
stl-compliant implementation to switch to.

I would deprecate isPointer and isReference too, but I can't find
a way to do it.

dune/common/typetraits.hh

@@ -69,10 +69,10 @@ namespace Dune
 
   public:
     enum { isPointer = PointerTraits<T>::result };
-    typedef typename PointerTraits<T>::PointeeType PointeeType;
+    typedef typename PointerTraits<T>::PointeeType PointeeType DUNE_DEPRECATED_MSG("Use remove_pointer instead!");
 
     enum { isReference = ReferenceTraits<T>::result };
-    typedef typename ReferenceTraits<T>::ReferredType ReferredType;
+    typedef typename ReferenceTraits<T>::ReferredType ReferredType DUNE_DEPRECATED_MSG("Use remove_reference instead!");
   };
 
   /**