JOPLIN, Mo. (AP) – Less than a week after a tornado wiped a big chunk of Joplin off the map, the city is beginning to shift its focus toward the next challenge: rising from the ruins.     And the town that gained fame as a stop along Route 66 can use the road maps drawn by other storm-savaged communities that have endured the same long journey.     Not far from Joplin, tiny Pierce City and Stockton rebuilt piece by piece after tornadoes in 2004 reduced much of them to rubble. Greensburg, Kan., did the same, starting over after a 2007 twister leveled the town.     Those towns didn’t face the same scale of death and decimationas Joplin, and their rebirths took years of hard work. But they offer hope that comebacks are possible.