Add symlink method to util.opener. Differences from os.symlink: - the symlink name is relative to the opener base directory - if a file with that name already exists, it's removed - if necessary, parent directories are created - if the system (OS or filesystem) doesn't support symlinks, a regular file is created. Its contents are the symlink target.

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To run the tests, do:

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cd tests/

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python run-tests.py

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See http://www.selenic.com/mercurial/wiki/index.cgi/WritingTests for

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more information on writing tests.