TODO this is less efficient on python2

Some functions changed return type from python2 to python3

TODO: not everything is tested, a full review is needed + run is needed

Use stream.isatty() instead.

python modernize.py --no-six -f libmodernize.fixes.fix_print -w

With manual fixes as the import was put always on top.

This might not be enough for print() and could need a locale.setlocale()
even though it is generally discouraged.

closes #1352

autopep8 -i --select=W602
Also some other minor deprecated syntax changes, like "while 1".
I did not commit the less obvious changes.

refs #806

This is recommended by Debian.
closes #618

And better defaults.
closes #920