Split activities into pages in the admin interface

and other trivial fixes

www/admin/aktiviteter/delete.php

@@ -9,5 +9,7 @@ $query = 'DELETE FROM events WHERE id=\'' . $eventID . '\'';
 $statement = $pdo->prepare($query);
 $statement->execute();
 
-header('Location: ' . $_SERVER['HTTP_REFERER']);
-?>
+
+?>
+
+<a href=".?page=1">Om du ikke ble automatisk omdirigert tilbake klikk her</a>