Module not found error no module named pytest

[ikondov]

Closes #535

Summary

Major changes:

• fix 1: do not print a warning but a log message (with the original text) at the debug level, Python traceback omitted
• fix 2: set a default streaming log level in fw_config.py and use this in fix 1 because no global value for the log level available
• change 1: reuse the default streaming log level in all other modules in the package where "INFO" has been used as default (second commit).
• change 2: adapted the docs for fix 2 and change 1.

Todos

None.

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install