chmod: setuid/setgid bit bugfix and new tests.

* sysif.c (chmod_wrap): Again, related to the = operator, we
must not punch a hole in the suid and sgid bits for all
non-directory objects. This was based on a misinterpretation
of some coreutils documentation, and doesn't match the
actual behavior.  Rather, if the owner is a target (including
implicitly) then we mask out suid; and if the group owner is a
targe, then we mask out sgid.  Thus when we are doing a
permission set not targetting the owner we don't touch suid,
and similarly for the group owner and setgid.

* tests/018/chmod.tl: Failed test diagnostics now
identify which mode string was used.
Some existing tests involving the suid/sgid bits
have to be revised because this commit reflects
a correction in the requirements. One new test is added.

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