Fix dict ordering assumption for Python < 3.6.0 #1464
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Fix for #1462, issue is that we were relying on the preservation of dict insertion order during batch updates. This was fine for Python 3.6+, but not for 2.7 and, I suspect, not for 3.5. Now use
OrdererdDictobjects.Some background at https://stackoverflow.com/questions/39980323/are-dictionaries-ordered-in-python-3-6