Fix bundle repos to use an index tuple consistent with revlogng The bundle repo code was adding a field to the index tuple, which confused the revlogng changes. This creates a new dict instead to maintain the extra bundle info.

<item>
    <title>#tag|escape#</title>
    <link>#url#?cs=#node|short#</link>
    <description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
    <pubDate>#date|rfc822date#</pubDate>
</item>