7zip filter: minimum docs and test

website/download.html

@@ -68,7 +68,7 @@ function showdiv(viewid)
 <h2><a name="general">General information</a></h2>
 
 <p>The current version is 1.20.4. <a href="release-1.20.html">Release
-notes</a>.</p>
+    notes</a>.</p>
 
 <p>The download page for Recoll 1.19 is <a href="download-1.19.html">still
 available</a>.</p>
@@ -122,7 +122,11 @@ is probably no necessity to upgrade anyway.</p>
 subdirectory, because of all the places they're referred from
 (package watches) -->
 
-<p><a href="recoll-1.20.4.tar.gz">recoll-1.20.4.tar.gz</a>. </p>
+<p><a href="recoll-1.20.4.tar.gz">recoll-1.20.4.tar.gz</a>.</p>
+
+<p>If you want to run with Qt 5 (5.3), you can
+try <a href="recoll-1.20.5.tar.gz">recoll-1.20.5.tar.gz</a>. No
+changes, except for Qt 5 (5.3.2) compatibility tweaks.</p>
 
 <!--
 <h3>Snapshot</h3>