Longmire fans' prayers may have been answered. I've learned that Netflix is deep in negotiations for a fourth season of the drama series. The news comes two and a half months after Longmire's surprise cancellation by A&E after three seasons. The axing triggered one of the biggest outpourings of fan support, with reaction ranging from shock and disbelief to anger amd a call to arms in a massive save-the-show campaign. Sources caution that negotiations between Netflix and Lo…