FLORENCE, Ariz. — The nation’s third execution in six months to go awry has rekindled the debate over the death penalty and handed potentially new evidence to those building a case against lethal injection as cruel and unusual punishment. Joseph Rudolph Wood took nearly two hours to die and gasped for about 90 minutes during his execution in Arizona on Wednesday. The execution took so long that his lawyers had time to file an emergency appeal while it was ongoing. The Arizona Supreme Court also called an …