Improved output (dry run)

[darkdragon]

Please improve (default) output for *--dry-run*.

Specifically, it would be nice to imply *-v* since dry runs without
displaying anything make no sense.

Further (independently from dry run), it would be nice to have an option to
hide directories which did *not* change. The need to *grep* results is
really frustrating and error prone.

Thanks a lot!
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