* develop-olympus:
[ticket/10046] Do not link bots to cron.php.
[ticket/10046] No longer change $phpbb_root_path to an absolute path for cron.
[ticket/10046] Call flush() in cron.php
[ticket/10046] Remove calls to register_shutdown_function() in cron.php
Conflicts:
phpBB/cron.php
phpBB/includes/functions.php