Fixed: NzbGet DUPE/COPY status should be considered failure.

fixes #919
closes #693
closes #505

src/NzbDrone.Core/Download/Clients/Nzbget/Nzbget.cs

@@ -172,9 +172,16 @@ namespace NzbDrone.Core.Download.Clients.Nzbget
                 }
 
                 if (!successStatus.Contains(item.DeleteStatus) && item.DeleteStatus.IsNotNullOrWhiteSpace())
+                {
+                    if (item.DeleteStatus == "COPY" || item.DeleteStatus == "DUPE")
+                    {
+                        historyItem.Status = DownloadItemStatus.Failed;
+                    }
+                    else
                     {
                         historyItem.Status = DownloadItemStatus.Warning;
                     }
+                }
 
                 if (item.DeleteStatus == "HEALTH")
                 {