RBS, regulators may rain on Barclays-AMB AMRO parade
                                
                                
                                    (Newser) -
                                    Britain's Barclays Bank and Dutch bank ABN Amro have agreed to merge, creating one of the world's largest banks. The $90 billion deal is far from a sure thing, however—it requires approval by shareholders and regulators, and a group led by Barclays' archrival, the Royal Bank of Scotland, has...