Various minor logging improvements #676
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Rationale:
* Logging to STDERR enables separation of processable output (e.g.,
`--version` or `--help`) and ephemeral status/error messages.
* A single file descriptor for all log messages makes it easier for
users to capture all log messages.
* Consistency: it's what most utilities do.
This avoids problems when logging a string that might have metacharacters.
This makes it easier to tell where multi-line log messages begin and end.
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