Editors note: This BBQ joint s now closed. The first of Oak Cliff's three new BBQ joints, Papa Joe's Backyard BBQ, opened today with an 11am ribbon cutting. Friends and family were on hand to see Lee and Beverly Alvarez's two-year labor of love come to life. Lockhart Smokehouse, located in the Bishop Arts district, will open next Wednesday. Luckie's Smokehouse BBQ, located at 1300 W. Davis across from the Kessler Theater, is also opening very soon. Papa Joe's is located in Oak Cliff's Elmwood neighborhood, near Edgefield and Illinois Aves. and also close to the Alvarez's home. The restaurant…