diff --git a/lemon/bits/traits.h b/lemon/bits/traits.h
--- a/lemon/bits/traits.h
+++ b/lemon/bits/traits.h
@@ -1,7 +1,6 @@
-
-/* -*- C++ -*-
+/* -*- mode: C++; indent-tabs-mode: nil; -*-
  *
- * This file is a part of LEMON, a generic C++ optimization library
+ * This file is a part of LEMON, a generic C++ optimization library.
  *
  * Copyright (C) 2003-2008
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
@@ -29,7 +28,7 @@
 namespace lemon {
   template <typename _Graph, typename _Item>
   class ItemSetTraits {};
-  
+
 
   template <typename Graph, typename Enable = void>
   struct NodeNotifierIndicator {
@@ -37,16 +36,16 @@
   };
   template <typename Graph>
   struct NodeNotifierIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::NodeNotifier::Notifier, void>::type
-  > { 
+  > {
     typedef typename Graph::NodeNotifier Type;
   };
 
   template <typename _Graph>
   class ItemSetTraits<_Graph, typename _Graph::Node> {
   public:
-    
+
     typedef _Graph Graph;
 
     typedef typename Graph::Node Item;
@@ -57,13 +56,13 @@
     template <typename _Value>
     class Map : public Graph::template NodeMap<_Value> {
     public:
-      typedef typename Graph::template NodeMap<_Value> Parent; 
-      typedef typename Graph::template NodeMap<_Value> Type; 
+      typedef typename Graph::template NodeMap<_Value> Parent;
+      typedef typename Graph::template NodeMap<_Value> Type;
       typedef typename Parent::Value Value;
 
       Map(const Graph& _digraph) : Parent(_digraph) {}
-      Map(const Graph& _digraph, const Value& _value) 
-	: Parent(_digraph, _value) {}
+      Map(const Graph& _digraph, const Value& _value)
+        : Parent(_digraph, _value) {}
 
      };
 
@@ -75,16 +74,16 @@
   };
   template <typename Graph>
   struct ArcNotifierIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::ArcNotifier::Notifier, void>::type
-  > { 
+  > {
     typedef typename Graph::ArcNotifier Type;
   };
 
   template <typename _Graph>
   class ItemSetTraits<_Graph, typename _Graph::Arc> {
   public:
-    
+
     typedef _Graph Graph;
 
     typedef typename Graph::Arc Item;
@@ -95,13 +94,13 @@
     template <typename _Value>
     class Map : public Graph::template ArcMap<_Value> {
     public:
-      typedef typename Graph::template ArcMap<_Value> Parent; 
-      typedef typename Graph::template ArcMap<_Value> Type; 
+      typedef typename Graph::template ArcMap<_Value> Parent;
+      typedef typename Graph::template ArcMap<_Value> Type;
       typedef typename Parent::Value Value;
 
       Map(const Graph& _digraph) : Parent(_digraph) {}
-      Map(const Graph& _digraph, const Value& _value) 
-	: Parent(_digraph, _value) {}
+      Map(const Graph& _digraph, const Value& _value)
+        : Parent(_digraph, _value) {}
     };
 
   };
@@ -112,16 +111,16 @@
   };
   template <typename Graph>
   struct EdgeNotifierIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::EdgeNotifier::Notifier, void>::type
-  > { 
+  > {
     typedef typename Graph::EdgeNotifier Type;
   };
 
   template <typename _Graph>
   class ItemSetTraits<_Graph, typename _Graph::Edge> {
   public:
-    
+
     typedef _Graph Graph;
 
     typedef typename Graph::Edge Item;
@@ -132,13 +131,13 @@
     template <typename _Value>
     class Map : public Graph::template EdgeMap<_Value> {
     public:
-      typedef typename Graph::template EdgeMap<_Value> Parent; 
-      typedef typename Graph::template EdgeMap<_Value> Type; 
+      typedef typename Graph::template EdgeMap<_Value> Parent;
+      typedef typename Graph::template EdgeMap<_Value> Type;
       typedef typename Parent::Value Value;
 
       Map(const Graph& _digraph) : Parent(_digraph) {}
-      Map(const Graph& _digraph, const Value& _value) 
-	: Parent(_digraph, _value) {}
+      Map(const Graph& _digraph, const Value& _value)
+        : Parent(_digraph, _value) {}
     };
 
   };
@@ -156,17 +155,17 @@
 
   template <typename Map>
   struct MapTraits<
-    Map, typename enable_if<typename Map::ReferenceMapTag, void>::type > 
+    Map, typename enable_if<typename Map::ReferenceMapTag, void>::type >
   {
     typedef True ReferenceMapTag;
-    
+
     typedef typename Map::Key Key;
     typedef typename Map::Value Value;
 
     typedef typename Map::ConstReference ConstReturnValue;
     typedef typename Map::Reference ReturnValue;
 
-    typedef typename Map::ConstReference ConstReference; 
+    typedef typename Map::ConstReference ConstReference;
     typedef typename Map::Reference Reference;
  };
 
@@ -184,11 +183,11 @@
 
   template <typename MatrixMap>
   struct MatrixMapTraits<
-    MatrixMap, typename enable_if<typename MatrixMap::ReferenceMapTag, 
-                                  void>::type > 
+    MatrixMap, typename enable_if<typename MatrixMap::ReferenceMapTag,
+                                  void>::type >
   {
     typedef True ReferenceMapTag;
-    
+
     typedef typename MatrixMap::FirstKey FirstKey;
     typedef typename MatrixMap::SecondKey SecondKey;
     typedef typename MatrixMap::Value Value;
@@ -196,7 +195,7 @@
     typedef typename MatrixMap::ConstReference ConstReturnValue;
     typedef typename MatrixMap::Reference ReturnValue;
 
-    typedef typename MatrixMap::ConstReference ConstReference; 
+    typedef typename MatrixMap::ConstReference ConstReference;
     typedef typename MatrixMap::Reference Reference;
  };
 
@@ -209,7 +208,7 @@
 
   template <typename Graph>
   struct NodeNumTagIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::NodeNumTag, void>::type
   > {
     static const bool value = true;
@@ -222,7 +221,7 @@
 
   template <typename Graph>
   struct EdgeNumTagIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::EdgeNumTag, void>::type
   > {
     static const bool value = true;
@@ -235,7 +234,7 @@
 
   template <typename Graph>
   struct FindEdgeTagIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::FindEdgeTag, void>::type
   > {
     static const bool value = true;
@@ -248,7 +247,7 @@
 
   template <typename Graph>
   struct UndirectedTagIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::UndirectedTag, void>::type
   > {
     static const bool value = true;
@@ -261,7 +260,7 @@
 
   template <typename Graph>
   struct BuildTagIndicator<
-    Graph, 
+    Graph,
     typename enable_if<typename Graph::BuildTag, void>::type
   > {
     static const bool value = true;