explain vector<INode*> functions

Param/Node/INode.h

@@ -82,6 +82,10 @@ protected:
     std::vector<double> m_P;
 };
 
+//  ************************************************************************************************
+//  vector concatenation, for use in getChildren functions
+//  ************************************************************************************************
+
 template <class T>
 std::vector<const INode*>& operator<<(std::vector<const INode*>& v_node,
                                       const std::unique_ptr<T>& node)