added new DL mode: Progressive. This is a random mode that ensures no more than 50MB of free space will be written in the file at once. This should effectively remove the lag when initiating a DL on a big file, while keeping enough entropy to ensure a good dissemination of chunks

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6164 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/gui/TransfersDialog.h

@@ -116,6 +116,7 @@ private slots:
     void changeQueuePosition(QueueMove) ;
 
     void chunkRandom();
+    void chunkProgressive();
     void chunkStreaming();
 
     void showDetailsDialog();
@@ -166,6 +167,7 @@ private:
     QAction *queueTopAct;
     QAction *queueBottomAct;
     QAction *chunkRandomAct;
+    QAction *chunkProgressiveAct;
     QAction *chunkStreamingAct;
     QAction *detailsfileAct;
     QAction *toggleShowCacheTransfersAct;