Include location info in logging calls

[artgoldberg]

Provide file, function & line number in logging calls. Unfortunately, logging2 doesn't support stacklevel (which logging added in 3.8), which would make this easy.
Submitted issue asking for stacklevel to logging2.

When working, put {source}:{function:s}:{line:d} in logger templates in debug log config files.

Also fix in wc_sim.

[artgoldberg]

Based on response from the author of logging2, he won't be making further changes to the repo.