assume all persisted sources were successful

core/src/main/groovy/com/muwire/core/download/DownloadManager.groovy

@@ -172,6 +172,8 @@ public class DownloadManager {
             if (json.paused != null)
                 downloader.paused = json.paused
                 
+            downloader.successfulDestinations.addAll(destinations) // if it was persisted, it was successful
+                
             try {
                 downloader.readPieces()
                 if (!downloader.paused)

core/src/main/groovy/com/muwire/core/download/Downloader.groovy

@@ -59,7 +59,7 @@ public class Downloader {
     private final File incompleteFile
     final int pieceSizePow2
     private final Map<Destination, DownloadWorker> activeWorkers = new ConcurrentHashMap<>()
-    private final Set<Destination> successfulDestinations = new ConcurrentHashSet<>()
+    final Set<Destination> successfulDestinations = new ConcurrentHashSet<>()
     /** LOCKING: itself */
     private final Map<Destination, Integer> failingDestinations = new HashMap<>()
     private final int maxFailures