Consider using division operator from future module

[talumbau]

Regarding the small differences between Python 2 and Python 3, the only thing that occurs to me is that there may be one or two operations occurring somewhere where the / operator is doing truncating integer division for Python 2 and float division for Python 3. It would be an interesting experiment to put from __future__ import division in all source files and see if the Py2 vs Py3 discrepancy is resolved. Making a note here to try myself, but whoever tries first should just report back results and if it resolves the findings in #1506

[martinholmer]

One experiment along the lines suggest in issue #1507 was conducted as part of the work involved in preparing merged pull request #1508. Adding the from __future__ import division statement to several files did not change any test_cpscsv.py results under Python 2.7.

[martinholmer]

@talumbau found the source of the Python 2.7 versus Python 3.x differences described in #1506.
The results of his investigation are in issue #1522.
So, the now obsolete issue #1507 is now being closed.