make hgweb use new archival module. also use "x-gzip" encoding for ".tar.gz" files, so mozilla and firefox will not transparently decompress stream and save with wrong name.

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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>