v1.21 2015 Oct 5th patch 0

Changed the retry logic to be based on lack of progress instead of being arbitrarily attributed to files retry counts

Fixed serious int overflow in lseek result handling - files between 2 and 4g (and 6 and 8g and 10-12...) ie whose size has bit 31 set and being set using block mode would fail

Removed the "e"xit command on receiver (dated from old times where the receiver would run forever by default)

Download resumption (TransferLogManager), thread history, checkpoints cleanup and important bug fixes