purge: cleanup
- remove casefolding check, no longer needed
- fold error function into remove
- simplify eol logic
- remove force logic and parameters
<item>
<title>#tag|escape#</title>
<link>{urlbase}{url}rev/{node|short}</link>
<description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
<pubDate>#date|rfc822date#</pubDate>
</item>