fix some rename/copy bugs - delete copy information when we update dirstate hg was keeping the copy state and marking things as copied on multiple commits - files that are renamed should have no parents if you do a rename/copy to an existing file, it should not be marked as descending from its previous revisions. - remove spurious print from filelog.renamed - add some more copy tests

requesting all changes
abort: error: Connection refused
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ls: copy: No such file or directory
requesting all changes
abort: HTTP Error 404: File not found
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