close [MW-1197] WORKBENCH DOESN'T DELETE ALL SELECTED ROWS WHEN DELET…

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Backend: tree_model: fix operator < so it fulfill strict weak ordering
this causes problem on OSX with libc++
review by Mike

backend/wbpublic/grt/tree_model.cpp

@@ -1,5 +1,5 @@
 /* 
- * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -127,7 +127,7 @@ bool NodeId::operator < (const NodeId &r) const
       // less than @r becomes false, therefore this node is greater than @r.
       for (size_t i = 0; i < index->size(); ++i)
       {
-        if ((*index)[i] > (*r.index)[i])
+        if ((*index)[i] >= (*r.index)[i])
         {
           ret = false;
           break;