The Calgary Flames were up to some late-evening business, announcing that they have re-signed forward Andrew Mangiapane to a three-year deal, avoiding arbitration. The Daily Faceoff’s Frank Seravalli reported the contract carries a $5.8MM AAV, bringing the total value to $17.4MM. The forward’s arbitration hearing was scheduled for this Friday, August 5th. By avoiding arbitration, Calgary now has access to the second buyout window, which will likely begin on Saturday, says Ryan Pike of Flames Nation. According to CapFriendly, the Flames are now left with just over $1.26MM in available cap space. By signing Mangiapane, Calgary is effectively buying out…