diff --git a/INSTALL b/INSTALL
--- a/INSTALL
+++ b/INSTALL
@@ -173,3 +173,25 @@
 --without-coin
 
    Disable COIN-OR support.
+
+
+Makefile Variables
+==================
+
+Some Makefile variables are reserved by the GNU Coding Standards for
+the use of the "user" - the person building the package. For instance,
+CXX and CXXFLAGS are such variables, and have the same meaning as
+explained in the previous section. These variables can be set on the
+command line when invoking `make' like this:
+`make [VARIABLE=VALUE]...'
+
+WARNINGCXXFLAGS is a non-standard Makefile variable introduced by us
+to hold several compiler flags related to warnings. Its default value
+can be overridden when invoking `make'. For example to disable all
+warning flags use `make WARNINGCXXFLAGS='.
+
+In order to turn off a single flag from the default set of warning
+flags, you can use the CXXFLAGS variable, since this is passed after
+WARNINGCXXFLAGS. For example to turn off `-Wold-style-cast' (which is
+used by default when g++ is detected) you can use
+`make CXXFLAGS="-g -O2 -Wno-old-style-cast"'.
diff --git a/lemon/bellman_ford.h b/lemon/bellman_ford.h
--- a/lemon/bellman_ford.h
+++ b/lemon/bellman_ford.h
@@ -171,6 +171,11 @@
   /// \tparam LEN A \ref concepts::ReadMap "readable" arc map that specifies
   /// the lengths of the arcs. The default map type is
   /// \ref concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref BellmanFordDefaultTraits
+  /// "BellmanFordDefaultTraits<GR, LEN>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename LEN, typename TR>
 #else
@@ -933,6 +938,9 @@
   ///
   /// This class should only be used through the \ref bellmanFord()
   /// function, which makes it easier to use the algorithm.
+  ///
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm.
   template<class TR>
   class BellmanFordWizard : public TR {
     typedef TR Base;
diff --git a/lemon/bfs.h b/lemon/bfs.h
--- a/lemon/bfs.h
+++ b/lemon/bfs.h
@@ -121,6 +121,11 @@
   ///
   ///\tparam GR The type of the digraph the algorithm runs on.
   ///The default type is \ref ListDigraph.
+  ///\tparam TR The traits class that defines various types used by the
+  ///algorithm. By default, it is \ref BfsDefaultTraits
+  ///"BfsDefaultTraits<GR>".
+  ///In most cases, this parameter should not be set directly,
+  ///consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR,
             typename TR>
@@ -957,6 +962,9 @@
   ///
   /// This class should only be used through the \ref bfs() function,
   /// which makes it easier to use the algorithm.
+  ///
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm.
   template<class TR>
   class BfsWizard : public TR
   {
@@ -1295,11 +1303,11 @@
   /// \ref BfsVisitor "BfsVisitor<GR>" is an empty visitor, which
   /// does not observe the BFS events. If you want to observe the BFS
   /// events, you should implement your own visitor class.
-  /// \tparam TR Traits class to set various data types used by the
-  /// algorithm. The default traits class is
-  /// \ref BfsVisitDefaultTraits "BfsVisitDefaultTraits<GR>".
-  /// See \ref BfsVisitDefaultTraits for the documentation of
-  /// a BFS visit traits class.
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref BfsVisitDefaultTraits
+  /// "BfsVisitDefaultTraits<GR>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename VS, typename TR>
 #else
diff --git a/lemon/capacity_scaling.h b/lemon/capacity_scaling.h
--- a/lemon/capacity_scaling.h
+++ b/lemon/capacity_scaling.h
@@ -77,9 +77,14 @@
   ///
   /// \tparam GR The digraph type the algorithm runs on.
   /// \tparam V The number type used for flow amounts, capacity bounds
-  /// and supply values in the algorithm. By default it is \c int.
+  /// and supply values in the algorithm. By default, it is \c int.
   /// \tparam C The number type used for costs and potentials in the
-  /// algorithm. By default it is the same as \c V.
+  /// algorithm. By default, it is the same as \c V.
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref CapacityScalingDefaultTraits
+  /// "CapacityScalingDefaultTraits<GR, V, C>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
   ///
   /// \warning Both number types must be signed and all input data must
   /// be integer.
diff --git a/lemon/circulation.h b/lemon/circulation.h
--- a/lemon/circulation.h
+++ b/lemon/circulation.h
@@ -173,6 +173,11 @@
      The default map type is \c LM.
      \tparam SM The type of the supply map. The default map type is
      \ref concepts::Digraph::NodeMap "GR::NodeMap<UM::Value>".
+     \tparam TR The traits class that defines various types used by the
+     algorithm. By default, it is \ref CirculationDefaultTraits
+     "CirculationDefaultTraits<GR, LM, UM, SM>".
+     In most cases, this parameter should not be set directly,
+     consider to use the named template parameters instead.
   */
 #ifdef DOXYGEN
 template< typename GR,
diff --git a/lemon/cost_scaling.h b/lemon/cost_scaling.h
--- a/lemon/cost_scaling.h
+++ b/lemon/cost_scaling.h
@@ -104,9 +104,14 @@
   ///
   /// \tparam GR The digraph type the algorithm runs on.
   /// \tparam V The number type used for flow amounts, capacity bounds
-  /// and supply values in the algorithm. By default it is \c int.
+  /// and supply values in the algorithm. By default, it is \c int.
   /// \tparam C The number type used for costs and potentials in the
-  /// algorithm. By default it is the same as \c V.
+  /// algorithm. By default, it is the same as \c V.
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref CostScalingDefaultTraits
+  /// "CostScalingDefaultTraits<GR, V, C>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
   ///
   /// \warning Both number types must be signed and all input data must
   /// be integer.
@@ -136,8 +141,7 @@
     /// \brief The large cost type
     ///
     /// The large cost type used for internal computations.
-    /// Using the \ref CostScalingDefaultTraits "default traits class",
-    /// it is \c long \c long if the \c Cost type is integer,
+    /// By default, it is \c long \c long if the \c Cost type is integer,
     /// otherwise it is \c double.
     typedef typename TR::LargeCost LargeCost;
 
diff --git a/lemon/dfs.h b/lemon/dfs.h
--- a/lemon/dfs.h
+++ b/lemon/dfs.h
@@ -121,6 +121,11 @@
   ///
   ///\tparam GR The type of the digraph the algorithm runs on.
   ///The default type is \ref ListDigraph.
+  ///\tparam TR The traits class that defines various types used by the
+  ///algorithm. By default, it is \ref DfsDefaultTraits
+  ///"DfsDefaultTraits<GR>".
+  ///In most cases, this parameter should not be set directly,
+  ///consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR,
             typename TR>
@@ -887,6 +892,9 @@
   ///
   /// This class should only be used through the \ref dfs() function,
   /// which makes it easier to use the algorithm.
+  ///
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm.
   template<class TR>
   class DfsWizard : public TR
   {
@@ -1237,11 +1245,11 @@
   /// \ref DfsVisitor "DfsVisitor<GR>" is an empty visitor, which
   /// does not observe the DFS events. If you want to observe the DFS
   /// events, you should implement your own visitor class.
-  /// \tparam TR Traits class to set various data types used by the
-  /// algorithm. The default traits class is
-  /// \ref DfsVisitDefaultTraits "DfsVisitDefaultTraits<GR>".
-  /// See \ref DfsVisitDefaultTraits for the documentation of
-  /// a DFS visit traits class.
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref DfsVisitDefaultTraits
+  /// "DfsVisitDefaultTraits<GR>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename VS, typename TR>
 #else
diff --git a/lemon/dijkstra.h b/lemon/dijkstra.h
--- a/lemon/dijkstra.h
+++ b/lemon/dijkstra.h
@@ -192,6 +192,11 @@
   ///relatively time consuming process to compute the arc lengths if
   ///it is necessary. The default map type is \ref
   ///concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  ///\tparam TR The traits class that defines various types used by the
+  ///algorithm. By default, it is \ref DijkstraDefaultTraits
+  ///"DijkstraDefaultTraits<GR, LEN>".
+  ///In most cases, this parameter should not be set directly,
+  ///consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename LEN, typename TR>
 #else
@@ -1092,6 +1097,9 @@
   ///
   /// This class should only be used through the \ref dijkstra() function,
   /// which makes it easier to use the algorithm.
+  ///
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm.
   template<class TR>
   class DijkstraWizard : public TR
   {
diff --git a/lemon/hartmann_orlin.h b/lemon/hartmann_orlin.h
--- a/lemon/hartmann_orlin.h
+++ b/lemon/hartmann_orlin.h
@@ -106,6 +106,11 @@
   /// \tparam GR The type of the digraph the algorithm runs on.
   /// \tparam LEN The type of the length map. The default
   /// map type is \ref concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref HartmannOrlinDefaultTraits
+  /// "HartmannOrlinDefaultTraits<GR, LEN>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename LEN, typename TR>
 #else
@@ -127,8 +132,7 @@
     /// \brief The large value type
     ///
     /// The large value type used for internal computations.
-    /// Using the \ref HartmannOrlinDefaultTraits "default traits class",
-    /// it is \c long \c long if the \c Value type is integer,
+    /// By default, it is \c long \c long if the \c Value type is integer,
     /// otherwise it is \c double.
     typedef typename TR::LargeValue LargeValue;
 
diff --git a/lemon/howard.h b/lemon/howard.h
--- a/lemon/howard.h
+++ b/lemon/howard.h
@@ -106,6 +106,11 @@
   /// \tparam GR The type of the digraph the algorithm runs on.
   /// \tparam LEN The type of the length map. The default
   /// map type is \ref concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref HowardDefaultTraits
+  /// "HowardDefaultTraits<GR, LEN>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename LEN, typename TR>
 #else
@@ -127,8 +132,7 @@
     /// \brief The large value type
     ///
     /// The large value type used for internal computations.
-    /// Using the \ref HowardDefaultTraits "default traits class",
-    /// it is \c long \c long if the \c Value type is integer,
+    /// By default, it is \c long \c long if the \c Value type is integer,
     /// otherwise it is \c double.
     typedef typename TR::LargeValue LargeValue;
 
diff --git a/lemon/karp.h b/lemon/karp.h
--- a/lemon/karp.h
+++ b/lemon/karp.h
@@ -104,6 +104,11 @@
   /// \tparam GR The type of the digraph the algorithm runs on.
   /// \tparam LEN The type of the length map. The default
   /// map type is \ref concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref KarpDefaultTraits
+  /// "KarpDefaultTraits<GR, LEN>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename LEN, typename TR>
 #else
@@ -125,8 +130,7 @@
     /// \brief The large value type
     ///
     /// The large value type used for internal computations.
-    /// Using the \ref KarpDefaultTraits "default traits class",
-    /// it is \c long \c long if the \c Value type is integer,
+    /// By default, it is \c long \c long if the \c Value type is integer,
     /// otherwise it is \c double.
     typedef typename TR::LargeValue LargeValue;
 
diff --git a/lemon/min_cost_arborescence.h b/lemon/min_cost_arborescence.h
--- a/lemon/min_cost_arborescence.h
+++ b/lemon/min_cost_arborescence.h
@@ -112,17 +112,18 @@
   /// relatively time consuming process to compute the arc costs if
   /// it is necessary. The default map type is \ref
   /// concepts::Digraph::ArcMap "Digraph::ArcMap<int>".
-  /// \param TR Traits class to set various data types used
-  /// by the algorithm. The default traits class is
-  /// \ref MinCostArborescenceDefaultTraits
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref MinCostArborescenceDefaultTraits
   /// "MinCostArborescenceDefaultTraits<GR, CM>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifndef DOXYGEN
   template <typename GR,
             typename CM = typename GR::template ArcMap<int>,
             typename TR =
               MinCostArborescenceDefaultTraits<GR, CM> >
 #else
-  template <typename GR, typename CM, typedef TR>
+  template <typename GR, typename CM, typename TR>
 #endif
   class MinCostArborescence {
   public:
diff --git a/lemon/preflow.h b/lemon/preflow.h
--- a/lemon/preflow.h
+++ b/lemon/preflow.h
@@ -119,6 +119,11 @@
   /// \tparam GR The type of the digraph the algorithm runs on.
   /// \tparam CAP The type of the capacity map. The default map
   /// type is \ref concepts::Digraph::ArcMap "GR::ArcMap<int>".
+  /// \tparam TR The traits class that defines various types used by the
+  /// algorithm. By default, it is \ref PreflowDefaultTraits
+  /// "PreflowDefaultTraits<GR, CAP>".
+  /// In most cases, this parameter should not be set directly,
+  /// consider to use the named template parameters instead.
 #ifdef DOXYGEN
   template <typename GR, typename CAP, typename TR>
 #else