Add a sanity check to try and ensure that we have the right tools installed

scripts/ISO_copyFL2

@@ -30,6 +30,11 @@ if [ ! -e "$ISO" ]; then
 fi
 shift
 
+if ! type mdir 2>/dev/null; then
+    echo Fatal:  It looks like you have not installed the mtools package
+    exit 1
+fi
+
 # If we just want to look at the contents, do that
 if [ "$DIR" = "ls" ]; then
     mdir -i "$ISO"@@"$FAT_OFFSET" -/ -b