WIP: python-3 migration of Tools/PyUtils. Used 2to3 + manual massaging

Closed Walter Lampl requested to merge wlampl/athena:PyUtils_py3 into master

Updating code in Tools/PyUtils to work with both, python 2 and python 3. Laregly relying to the 2to3 utility + manual updates to maintain the python2 - compatibility.

Edited by Walter Lampl

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