Rename KgPerHa to MaxKgPerHa

Elwig/Models/WineAttr.cs

@@ -10,7 +10,7 @@ namespace Elwig.Models {
         [Column("name")]
         public string Name { get; set; }
 
-        [Column("kg_per_ha")]
+        [Column("max_kg_per_ha")]
-        public int KgPerHa { get; set; }
+        public int MaxKgPerHa { get; set; }
     }
 }