Functions used as console_scripts should not return output text

According to official documentation, the function should return an error code or 0 in case of no error.

Currently the console_scripts return the output text.

Because of this the return code is always 1, indicating an error even if everything is fine. And the text gets sent to stderr instead of stdout, which makes it harder to grep the output.

Proposed solution: Use print for regular output, return 0 or None in case of success, return an error code in case of error.