Andreas Gruenbacher db9f39507e Fix handling of renamed files
When a file has already been renamed, make sure it is not renamed back to its
old name.  Reported by Guido Draheim.
* src/patch.c (main): Make sure we never rename a file back to its previous
name. Report when a file was renamed already.
* tests/copy-rename: Add "already renamed" test cases.
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