[PATCH] copy/rename a directory
This patch adds support for 'hg copy dir1 dir2' or 'hg rename dir1 dir2'.
When "dir2" exists, "dir1" is recursively copied (or moved) to "dir2/dir1".
When "dir2" does not exists, "dir1" is copied to (renamed as) "dir2".
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<description>#file# revision history</description>
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