Add some '***'s to an error message to make it more visisble.

tbsetup/frisbeelauncher.in

@@ -58,7 +58,7 @@ my $filename = &get_filename($imageid);
 
 # Make sure that the user can read the image file or bomb out right now.
 if (! -R $filename) {
-	die("You do not have permission to read the image file for\n".
+	die("*** You do not have permission to read the image file for\n".
 	    "imageid $imageid: $filename\n");
 }