better logging

TODO.md

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+* plot cli command should show by default, not save
+* logger should hook to pbar when it exists
+* find a way to make evaluator debugging easier
+
+# Ideas
+
+* have a `scan` section in the config to more granularly control parameter scanning. That way, the user provides single default values to all necessary parameters and then call the single-sim or scan commands to run the config accordingly.