If the fiery hell holes of silent elevator shafts and devilishly high heat indexes have D.C. repenting with sweaty Hail Marys, there is an escape: find Alabama’s finest photographer and sculptor William Christenberry at any of four art relief stations around the city. Cool A/C, (photographed) ice-cold Coca-Cola, and – Hallelujah – none of those famous Tuscaloosan chitlins! Get on up, lil’ doggies, and drag yourself along on a Christenberry tour that’s as Southern as…