dsnap-sync: make 'pv' output selectable

src/bin/dsnap-sync

@@ -332,6 +332,10 @@ parse_params () {
 		donotify=false
 		shift 1
 		;;
+	    --nopv)
+		do_pv_cmd=false
+		shift 1
+		;;
             -p|--port)
 		port=$2
 		shift 2
@@ -1081,6 +1085,7 @@ Options:
  -n, --noconfirm             Do not ask for confirmation for each configuration. Will still prompt for backup
      --batch                 directory name on first backup"
      --nonotify              Disable graphical notification (via dbus)
+     --nopv                  Disable graphical progress output (disable pv)
  -r, --remote <address>      Send the snapshot backup to a remote machine. The snapshot will be sent via ssh.
                              You should specify the remote machine's hostname or ip address. The 'root' user
                              must be permitted to login on the remote machine.