Add "Plan:" line before the .plan file.

exec/fingerservice.js

@@ -419,6 +419,7 @@ write(format("Last login %s %s\r\nvia %s from %s [%s]\r\n"
 var plan;
 plan=format("%suser/%04d.plan",system.data_dir,u.number);
 if(file_exists(plan))
+	write("Plan:\r\b");
 	send_file(plan)
 else
 	write("No plan.\r\n");