hgweb: use generator to count parity of horizontal stripes for easier reading.
- use web.stripes in all places and consistently
- start with parity0 for lists generated in reverse (e.g. changelog)
abort: repository a not found!
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abort: error: Connection refused
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abort: repository a not found!
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abort: destination '../a' already exists
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abort: repository a not found!
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destination directory: q
abort: destination 'q' already exists