Make the scripts compatible with py3

[magopian]

This is a very straightforward change involving mainly adding parens to the print statements.

The non-trivial changes are in openfisca_france/scripts/parameters/baremes_ipp/xls_to_yaml_raw.py and openfisca_france/scripts/parameters/baremes_ipp/yaml_raw_to_yaml_clean.py:
changing ur to r in regexes.

I'm really baffled that those tests would pass without failing in py3 on circleCI previously ...

[magopian]

Ok, the tests were passing because in circleCI it's only specifically running nosetests, while in the Makefile it's also compiling all the python files to check for syntax errors.

I also realized that the check-no-prints, check-syntax-errors and flake8 are not run at all in circleCI. I've opened # for that matter.

[magopian]

This is now ready to review <3

[fpagnoux]

J'édite le changelog, pour expliciter que le modèle était compatible avec Python3, mais pas certains scripts additionnels.

[fpagnoux]

Ok, the tests were passing because in circleCI it's only specifically running nosetests, while in the Makefile it's also compiling all the python files to check for syntax errors.

I also realized that the check-no-prints, check-syntax-errors and flake8 are not run at all in circleCI. I've opened # for that matter.

The France model was already compatible with Python 3, but true, many additional scripts were not, thanks for dealing with that!

The makefile is a mess, and no one was brave enough to flake OpenFisca France after years of laxness.

[fpagnoux]

Rebased, waiting for the tests to pass to merge

[vinyll]

Could you fix the conflicts @magopian?

[magopian]

@vinyll @fpagnoux rebased!