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add a flatten to unzip.
I actually only patched in the mapper nested element support; with that the flatten attribute can only introduce inconsistency (what if you spec a mapper and flatten=true).
And the patch was modified to keep the attributes private, with a getMapper() operation for subclasses (like untar) to get when needed.
Did a bit of cleanup -especially of the unzip tests- while at it.
git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276981 13f79535-47bb-0310-9956-ffa450edef68