Add a count of elements to pagination elements (#219)

Also, add a second, upper pagination element to orders and attendees
list sites as those tend to get long.

src/pretix/control/templates/pretixcontrol/events/index.html

@@ -33,6 +33,6 @@
             {% endfor %}
             </tbody>
         </table>
+        {% include "pretixcontrol/pagination.html" %}
     {% endif %}
-    {% include "pretixcontrol/pagination.html" %}
 {% endblock %}