Author Lisa D’Amour tells us that the characters in her play “Detroit,” the dark comedy opening the season for The Theater Project, live in a “midsize American city” that is “not necessarily Detroit.” In this 2010 Pulitzer Prize finalist play, the author wants it to be known that tough economic times can bring the weird out in folks, even if they don’t live in the Motor City. The play takes place in the adjacent backyards of two modest “first-ring” suburban homes that once suggested a bright future for inhabitants on the way up the economic ladder.