ensure all status messages use stderr #267
Merged
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this means it's now possible to specify -f /dev/stdout and not have the messages break the stream.
closes #265
this is the easy way to make output pipeable- by making wf-recorder behave like a normal cli program where non-data is always stderr.
the other option is to add an explicit --stdout option or similar where -f is ignored and it outputs to fd 1, but i think this works too :)