`(exit N); exit N'. Otherwise, those many tests could exit with
improper exit status when exiting via e.g., a trapped interrupt.
Thanks to a report from Bob Proulx.
symlinks, even on hosts where that's not supported.
Test that if -R is specified without -H or L, -h is assumed.
Test that chown() is not optimized away.
group changed, since chgrp now changes unconditionally. This
complicates the sed script a bit. Do not specify --dereference,
since it's the default (and we want to test this). Adjust output
to match the fact that chgrp no longer optimizes the case of
changing a file's group to the same value as before.
Do `set +x' before starting the subshell
from which we invoke chgrp. Otherwise, the output from the
VERBOSE=yes-induced `set -x' would result in spurious differences.
