message: Bug fix for PR#3153
  After defining -cmd_mrg <oldcmd> <new_cmd> , using <oldcmd> would construct the new command , but
  silently drop it instead of pushing the new command into the command line.
diff: @@ -547,7 +547,6 @@ void CommandLineParser::processArgs_(const std::vector<std::string>& args,
  arg.append("+");
  arg.append(args[i + 1]);
  i += 1;
  - continue;
  } else {
  std::cerr << "Missing arguments to renamed command " << arg
  << std::endl;
  