Of all the rivalries in recent sports history, few have been as one-sided as the Wizards’ struggles against their Southeast Division antagonists, the Miami Heat. Indeed, it’s not clear you can even call it a rivalry, since in actual rivalries both sides sometimes win. D.C.’s hoopsters, by contrast, have been losing for a long time now. Sixteen straight games, including a four-game sweep in the 2006 Eastern Conference Semifinals, and sweeps of the regular season…