Improve applet help a little. Also, if mountinfo as any mounts given, work explictly with --netdev/--nonetdev

src/_usage.c

@@ -20,7 +20,7 @@ static void usage (int exit_status)
 	for (i = 0; longopts[i].name; ++i) {
 		int len = printf ("  -%c, --%s %s", longopts[i].val, longopts[i].name,
 		                  has_arg[longopts[i].has_arg]);
-		while (++len < 30)
+		while (++len < 37)
 			printf (" ");
 		puts (longopts_help[i]);
 	}