File transfer fixes

cmd/fileTransfer.go

fileTransfer/manager.go

fileTransfer/manager_test.go

fileTransfer/oldTransferRecovery.go

fileTransfer/oldTransferRecovery_test.go

fileTransfer/receive.go

fileTransfer/receiveNew.go

fileTransfer/receive_test.go

fileTransfer/send.go

fileTransfer/sendNew.go

fileTransfer/send_test.go

fileTransfer/sentRoundTracker.go

fileTransfer/utils_test.go

network/gateway/hostPool.go

network/message/pickup.go

network/sendCmix.go

network/sendCmixUtils.go

network/sendManyCmix.go