Backup system agnostic comments

src/freedombone-utils-backup

 
 function restore_directory_from_usb {
     if [ ! ${1} ]; then
-        echo "obnam restore -r $USB_MOUNT/backup/${2} --to ${1}"
+        echo "$USB_MOUNT/backup/${2} -> ${1}"
         echo $'No restore destination given'
         return
     fi
     if [ ! ${2} ]; then
-        echo "obnam restore -r $USB_MOUNT/backup/${2} --to ${1}"
+        echo "$USB_MOUNT/backup/${2} -> ${1}"
         echo $'No restore source given'
         return
     fi