Core/Groups: Store group member roles to DB

--HG--
branch : trunk

sql/base/characters_database.sql

@@ -1350,6 +1350,7 @@ CREATE TABLE `group_member` (
   `memberGuid` int(11) unsigned NOT NULL,
   `memberFlags` tinyint(2) unsigned NOT NULL,
   `subgroup` smallint(6) unsigned NOT NULL,
+  `roles` smallint(6) unsigned NOT NULL default '0',
   PRIMARY KEY  (`memberGuid`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=FIXED COMMENT='Groups';
 /*!40101 SET character_set_client = @saved_cs_client */;