Remove patchbomb from list of contrib files to install since it's now an extension.
Innosetup script was referencing old contrib location.
Also cosmetic change to group related files.
<item>
<title>#tag|escape#</title>
<link>#url#?cs=#node|short#</link>
<description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
<pubDate>#date|rfc822date#</pubDate>
</item>