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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adding dir/bar

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adding foo

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dir/bar

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foo

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adding dir/bar_2

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adding foo_2

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dir/bar_2

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foo_2

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adding a

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adding c

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adding b

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adding d

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removing a

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removing c

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recording removal of a as rename to b (100% similar)