The Dead Lands by Benjamin Percy Grand Central Publishing/Hachette Book Group, $26.00, 400 pages, ISBN 978-1-4555-2824-0 Ever had the flu?  Not a run-of-the-mill cold with sniffles and sneezing, but the real deal, with chills, fever, congestion . . . the kind that makes every bone on your body ache and hurt so much you just can’t get out of bed?  The kind that can put you in the hospital