Fixed: match='re' could produce duplicate test identifiers files.Files.regexp(pattern) now makes sure to return only one metafile for each matching virtual path, namely, the one that would be returned for that virtual path by files.Files.from_virtual_path.

\.(pyc|pyo|class|orig)$
^upreckon/(upreckon|_unix\.so)$
(/|^)suite$
^(build|dist|upreckon\.egg-info)$
^zipfiles/zipfile\d+-original.py$