* develop-olympus:
[ticket/10369] Replace root path with "[ROOT]" as per IRC.
[ticket/10369] Add warning about paths outside of phpBB root not being filtered
[ticket/10369] Rename filter_errfile() to filter_root_path().
[ticket/10369] DRY code to remove phpbb path from errfile.
[ticket/10369] Always include errfile and errline in format_errors().