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)

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adding da/foo

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adding foo

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% manifest

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200 Script output follows

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drwxr-xr-x da

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-rw-r--r-- 4 foo

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200 Script output follows

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-rw-r--r-- 4 foo

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