new chimerism chart; moved 'just testing' warnings from templates into L::Mail::_verify_service_status() for appending to all messages if not in production mode - can be overriden with '_safe_message' flag from caller
local changes for Bristol update: emailed messages contain test notice only if not in production; unreported requests worklist duration taken from config settings; config settings made available to Model classes; moved report output formatting to local template if not RR8
