rm sone unused code

Param/Node/INode.h

@@ -49,7 +49,7 @@ public:
     //! Returns all children.
     virtual std::vector<const INode*> nodeChildren() const;
 
-    //! Returns all descendants.
+    //! Returns all descendants. // TODO sep22: rm if it remains UNUSED
     std::vector<const INode*> nodeOffspring() const;
 
     static void requestGt0(std::vector<std::string>& errs, const double& val,