header abstraction: abstracted also in thread.html

Conflicts:
	templates/page.html
	templates/thread.html

templates/page.html

@@ -22,4 +22,4 @@
 		<p class="unimportant" style="margin-top:20px;text-align:center;">Powered by <a href="http://tinyboard.org/">Tinyboard</a> {{ config.version }} | <a href="http://tinyboard.org/">Tinyboard</a> Copyright &copy; 2010-2013 Tinyboard Development Group</p>
 	</footer>
 </body>
-</html>
+</html>