convert: make contents of "extra" dict available from sources, for sinks. This breaks hash preservation for hg->hg conversion, as each converted change gets a convert_revision item added to its extra dict. Ugh.

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Content-type: text/xml; charset={encoding}

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<?xml version="1.0" encoding="{encoding}"?>

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<rss version="2.0">

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  <channel>

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    <link>{urlbase}{url}</link>

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    <language>en-us</language>