hgweb: fix handling of path for old style template - path from old style are prefixed by '/', make cleanpath strip them - make manifest() use relative paths, that was the only function using '/' prefixed paths

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#header#

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    <title>#repo|escape# Changelog</title>

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    <description>#repo|escape# Changelog</description>

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    #entries%changelogentry#

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  </channel>

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</rss>