Katie and Jim Whitley and sons Jonathan Slade, 2, and infant Matthew Gunner are leaving Haines and heading back to Texas, where they’ll live in a small town outside of San Antonio. They moved here in April 2012. Katie worked as a dispatcher and Jim was a student at University of Alaska Southeast. Katie’s mother Kate Harropsaid all are invited to a farewell party at the Salvation Army 1 p.m. Sunday. Bring finger…