Philly dot ComPITTSBURGH - When Michael Merck's Pennsylvania remodeling crew is finished, sunlight that once streamed through dusty cracks in a vacant East Liberty home will strike a solar panel array capable of generating enough energy to support a family of five.At least, that's the goal the owner of West Penn Energy Solutions set for himself in a novel bid to transform a deteriorating 100-year-old shell of a house into a Zero Energy Home , a "green" living space that produces as much energy as its occupants consume in a year."We want to show that we can take this great example of Pittsburgh housing stock and convert it into something as energy efficient or more energy efficient than what people are building new," said Merck, 32, of Regent Square.Work began in March on the North St. Clair...