Correction de l'utilisation du namespace dans le .hpp de maniere a ce

que cela fonctionne

src/trace/DrawTrace.hpp

@@ -12,7 +12,7 @@
 #include "../interface/render_area.hpp"
 #include "../message/message_ns.hpp"
 
-using namespace message_ns;
+//using namespace message_ns;
 
 /*!
  * \brief 
@@ -172,7 +172,8 @@ public:
 
         if(container == NULL) {
 	  //            std::cerr << "The trace can not be shown because there are no containers." << std::endl;
-	  message << "Error a container does not exist. Cannot display the trace" << ende;
+	  message_ns::message << "Error a container does not exist. Cannot display the trace" ;
+	  message_ns::operator<<(message_ns::message, message_ns::ende); 
             return;
         }
         if (number_of_children(container) <= 1)