* rxu/ticket/10684:
[ticket/10684] Adjust function and parameter name, minor changes.
[ticket/10684] Rename function phpbb_get_banned_users_ids() parameter
[ticket/10684] Remove intval mapping for array keys
[ticket/10684] Adjust pm_notifications() to handle stale bans
[ticket/10684] Cast user_id to integer
[ticket/10684] Refactor $sql_ignore_users array update
[ticket/10684] Remove isset() for $sql_ignore_users update
[ticket/10684] Fix 2 typos in comment lines.
[ticket/10684] Send notifications for users with stale bans