feat: switch to py3

[andrzejnovak]

Consider switching to python3, since python2 is EOL? This was automatically processed via 2to3

I've verified that at least xsdbSearch.py works the same.

[andrzejnovak]

Pinging last active commit authors @szaleski @gqlcms

[Senphy]

@andrzejnovak

Since the current xsdb is based on the mongoDB, which is set up by some experts several years ago. The server is not easy to update via 2to3 directly.

For the scripts folder, it is possible to update via 2to3.

Thanks for your suggestions!