Market fish at Fawn in Decatur. (Courtesy of Morgan Wagoner)On March 19, Decatur will gain another spot from James Beard award-winning chef Terry Koval, when wine and amaro bar Fawn opens beside Cafe Alsace on East Ponce de Leon Avenue.Located around the corner from Koval’s Decatur restaurants, The Deer & the Dove and B-Side, Fawn seats just 35 people; a bar purposefully designed as an intimate gathering place for wine, amaro, and clever takes o…