29 September 2006 It will be 2008, at the earliest, before Iraq’s southern provinces unite to form the giant oil-rich federal region that some Iraqi groups are calling for. That’s the deal reached this week by Shiite and Sunni lawmakers which, for now at least, averts further ethnic and religious strife over a Shiite-backed law outlining the mechanisms whereby Iraq’s provinces can form autonomous regions. But the arrangement, brokered by…