label help uses infoboxes, real help system

help/1.php

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+<h1>Help for SQL expressions</h1>
+
+<h2>Description</h2>
+
+<p>The &laquo;SQL expression&raquo; is added to WHERE clause of
+	view feed query. You can match on ttrss_entries table fields
+	and even use subselect to query additional information. This 
+	functionality is considered to be advanced and requires basic
+	understanding of SQL.</p>
+	
+<h2>Examples</h2>
+
+<p>Match all unread articles:</p>
+
+<pre>unread = true</pre>
+
+<p>Matches all articles which mention Linux in the title:</p>
+
+<pre>title like '%Linux%'</pre>
+
+<p>See the database schema included in the distribution package for gruesome
+details.</p>
+