I got a note the other day from Craig Settles, an expert in the area of municipal WiFi networks, who wanted to make sure I’d seen the news about EarthLink pulling out of the muni WiFI network in Philadelphia. (Incidentally, last month EarthLink also made known its plans to pull out of the muni WiFi project in New Orleans, effective May 18.)   In a press announcement dated May 13, EarthLink made clear its plans to terminate WiFi service in Philadelphia, following months of unsuccessful negotiations with the city government to transfer management of the entire network — worth $17 million — to the municipality or to Wireless Philadelphia, a non-profit.   “EarthLink has worked diligently for many months to transfer our WiFi network to a new owner -- at no cost," said Rolla Huff, EarthLink's chairman and chief executive officer, in a statement. “Unfortunately, our hope that we could transfer our network to a non-profit organization that had planned to offer free WiFi throughout Philadelphia will not be realized.