[Bug-tar] tar v1.15.1 and --newer

[Robert Urban]

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it is unfortunate that there is no way to control informational output
when using --newer=DATE. This produces lines of the format:

tar: ./b.bak: file is unchanged; not dumped

on stderr :(  This means I can't use stderr to decide if an error has
occurred, or if I get a non-zero exit status, I can't just dump whatever
was written to stderr in a log, because my log files would explode.

There should be a flag to control this output.

Robert Urban
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