offer zip file with plaintext

closes #2

src/main/webapp/WEB-INF/jsp/components/searchResults.jsp

@@ -57,6 +57,7 @@
 			<a class="tg dropdown_toggle -download">${i18n['download-all']}</a>
 			<ul class="tg dropdown_menu">
 				<li class="tg dropdown_item"><a class="tg dropdown_link" href="${aggregatorUrl}/zip/query?query=${utils:urlencode(realQueryString)}${filterQueryString}${aggregatorSandboxParam}" data-type="zip">ZIP</a></li>
+        <li class="tg dropdown_item"><a class="tg dropdown_link" href="${aggregatorUrl}/zip/query?query=${utils:urlencode(realQueryString)}${filterQueryString}${aggregatorSandboxParam}&transform=text&meta=false&only=text/xml&dirnames=" data-type="zip">ZIP / text only</a></li>
 <!-- other exports do not work yet
 				<li class="tg dropdown_item"><a class="tg dropdown_link" href="${aggregatorUrl}/epub/query?query=${query}${filterQueryString}" data-type="ebook">E-Book</a></li>
 				<li class="tg dropdown_item"><a class="tg dropdown_link" href="${aggregatorUrl}/teicorpus/query?query=${query}${filterQueryString}" data-type="tei-corpus">TEI-Corpus</a></li>