Ce 555 extension randomrootpage

Adds Special:RandomRootPage that extends Special:Random
Uses same SQL query extending it by part page_title NOT LIKE '%/%'

@SQLReview 

explain SELECT /* RandomPage::selectRandomPageFromDB R-Frank88 */  page_title,page_namespace  FROM `page` FORCE INDEX (page_random) WHERE page_namespace = '0' AND page_is_redirect = '0' AND (page_random >= 0.363089410697) AND (page_title NOT LIKE '%/%')  ORDER BY page_random LIMIT 1;
+----+-------------+-------+-------+---------------+-------------+---------+------+-------+-------------+
| id | select_type | table | type  | possible_keys | key         | key_len | ref  | rows  | Extra       |
+----+-------------+-------+-------+---------------+-------------+---------+------+-------+-------------+
|  1 | SIMPLE      | page  | range | page_random   | page_random | 8       | NULL | 76888 | Using where |
+----+-------------+-------+-------+---------------+-------------+---------+------+-------+-------------+
1 row in set (0.00 sec)