The Phillies are back, with high hopes and a couple big question marks named Utley and Howard. The Flyers have made it into the National Hockey League playoffs, and the Sixers are fighting to secure a postseason slot. Another Philadelphia April is halfway gone. If you’re a sports fan and a cable subscriber, you could have caught much of this winter and spring’s action on Comcast SportsNet, which carries a majority of this city’s baseball, hockey and basketball games.