* develop-olympus: [ticket/10605] Use database updater function _sql() instead of $db->sql_query() [ticket/10605] Put end of array on its own line because start of array is too. [ticket/10605] Add parameter documentation to phpbb_delete_user_pms [ticket/10605] Fix left join usage. [ticket/10605] Add a section for updating from 3.0.10 to schema updates. [ticket/10605] Fix syntax error in database updater. [ticket/10605] Reset user´s pm count to 0 when deleting his PMs [ticket/10605] Split query to be able to use indexes [ticket/10605] Rename $delete_rows to $delete_ids. [ticket/10605] Break long comment into multiple lines 80 chars short. [ticket/10605] Remove unnecessary $delete_ids array. [ticket/10605] Remove unnecessary array_keys calls on $delete_rows. [ticket/10605] Remove unused variable declarations. [ticket/10605] Turn $undelivered_user into a real array of counters. [ticket/10605] Use unset() instead of checking user_id over and over again. [ticket/10605] Prefix function with phpbb_ and use true instead of 1 [ticket/10605] Delete orphan private messages on update [ticket/10605] Check for orphan privmsgs when deleting a user