* dryrun.test: It would still fail at random times, because `cp'

* dryrun.test: It would still fail at random times, because `cp'
and `mv' are not guaranteed to preserve the timestamps of the
installed files.  Instead of preserving them, just remove them
before the dry uninstall test.  Redirect dry-run output to stderr,
so that it can be easily separated from the regular output.