Fix for issue #4787

[jkppr]

One line description of pull request

Moving _PrintUserWarning output to stderr and adding a logfile argument to pinfo_tools.

Description:

This fixes the issues described in #4787

Related issue (if applicable): fixes #4787

Notes:

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One of the maintainers will examine your code, and may request changes. Check off the items below in order, and then a maintainer will review your code.

Checklist:

• [x] Automated checks (GitHub Actions, AppVeyor) pass
• [x] No new new dependencies are required or l2tdevtools has been updated
• [x] Reviewer assigned

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4ca7060) 86.02% compared to head (af5c46c) 86.04%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4792 +/- ## ========================================== + Coverage 86.02% 86.04% +0.02% ========================================== Files 416 416 Lines 37680 37654 -26 ========================================== - Hits 32414 32400 -14 + Misses 5266 5254 -12 ```

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