US Stocks Advance as Oil Prices Slide on USIran Diplomatic Signals GM Unveils AllElectric Cadillac Vistiq with 300Mile Range RBIs Surprise Rate Cut Dilutes Policy Framework Nomura Suggests SP 500 Edges Higher as Healthcare and Technology Lead BroadBased Gains Walmart Inc WMT Maintains Strong Support from Wall Street and Investment Analyst Louis Navellier Free Fish Fillet Program Offers Lifeline to Maines Groundfishing Industry Amid Rising Costs Vestas Wind Systems Stock Slides on Margin Guidance Concerns