Fans of “Mister Rogers’ Neighborhood” might appreciate this: The Pittsburgh house where Fred Rogers lived in the late-’50s and early-’60s is on the market.  The asking price is $850,000.  While Fred was living here, he was attending the Pittsburgh Theological Seminary and worked as a composer, organist, and puppeteer on “The Children’s Corner.  Fred and his wife Joanne had their two sons at that time . . . James, who was born in 1959 and John, who was born in 1961.