Use print() function in both Python 2 and Python 3

[cclauss]

Python 2 died 660 days ago on 1/1/2020 so it may no longer be available on modern OSes. Legacy print statements are syntax errors in Python 3 but print() function works as expected in both Python 2 and Python 3.

% futurize -f libfuturize.fixes.fix_print_with_import -w .

[mcw0]

1. Issues has been disabled for these PoC's, as they are simply PoC, Public Domain and unsupported.
2. I know python2 is dead, that's why I only write in python3 nowadays
3. Your print() changes doesn't make my old python2 PoC python3 ported
4. I would consider to merge your changes of my PoC, if all PoC's been ported to python3

[cclauss]

The title of the pr is clear. This PR is not claiming that these files are fully Python 3 compatible. It is only claiming that one of the most tedious and error prone parts of Python 3 porting has been done in a way that does not break compatibility with legacy Python.

I have successfully led the porting of many complex codebases to Python 3 (e.g.: Node.js, InternetArchive/OpenLibrary, etc.) so I know that the port is not automatic and seldom happens in a single pull request except for trivial codebases.

[mcw0]

From 'we' to 'I'... I noted all forks() and PR's been done in other repos, that makes me wonder what mission you may have?

Listen, I appreciate the work that has been done, but w/o full port to python3 and verified with PoC target (or python2 bug fixes), I will not accept PR, sorry. I'll keep this open for a while tough.