Output validation errors on stdout, slightly prettier formatted #4424
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Moves all validation output to stdout.
I think this makes sense, because a validation error is the expected output from the validator, and what you want to process if you pipe the output. Not signifying a problem with execution of the command.
I guess this could be argued both ways. But at least having all the outputs on the same stream seems like an improvement to me.
Fixes #453 (by adding a line break between warnings)