In the last two and a half years, the city of St. Louis has been faced with an growing epidemic — a phenomenon terrorizing drivers from St. Louis Hills to downtown, from Shaw to the Central West End. The epidemic has transformed once-ordinary errands into inducers of anxiety, forcing commuters to confront their core weaknesses ... or drive blocks out of their way to find an alternative.We're talking, of course, about back-in angle parking: spots on the street requiring drivers to back in so the trunk faces the curb.…