Amid all the facts and figures discussed at a forum on affordable housing Saturday, one fact stood out from all the rest: Affordable housing in Connecticut is no longer an issue only for low income earners, but also for those earning middle class incomes.The panel, called “Pitching Your Tent in Cornwall: A Panel Discussion on Affordable Housing in One Connecticut Town,” took place at town hall. It was a timely discussion of an issue that is becoming increasingly urgent across the state where housing costs have mushroomed by almost 64 percent between 2000 and 2005, while wages rose 18.5 percent.