- modified DeleteCallbackChain interface

- fixed killNode message to be sent for every node killed

hipadaba.h

@@ -352,11 +352,11 @@ void *FindHdbCallbackData(pHdb node, void *userPtr);
  */
 int InvokeCallbackChain(pHdb node, pHdbMessage message);
 /**
- * Deletes a callback chain. This is internal, normal users
- * should nto use this function. Or you create a mess!
- * @param root The callback chain to remove
+ * Deletes the callback chain of a node. This is internal, normal users
+ * should not use this function. Or you create a mess!
+ * @param node The node
  */
-void DeleteCallbackChain(pHdbCallback root);
+void DeleteCallbackChain(pHdb node);
 /**
  * apply message to the node and all its children
  * @param node Th node where to start recursing