put documentation into Common group

[[Imported from SVN: r2133]]

common/autoptr.hh

@@ -4,6 +4,15 @@
 #define DUNE_AUTOPTR_HH
 
 namespace Dune {
+
+  /** @addtogroup Common
+      @{
+   */
+
+  /** \file
+     Class implementing automatic reference counting
+   */
+
   /** \brief An auto pointer class */
   template <class Pointer>
   class AutoPointer
@@ -90,5 +99,8 @@ namespace Dune {
       return (*this);
     }
   };
+
+  /** @} */
+
 } // end namespace Dune
 #endif