void usageExit(std::string const& msg)
{
    std::cerr
	<< std::endl
	<< whoami << ": " << msg << std::endl
	<< std::endl
	<< "Usage: " << whoami << " [options] infile outfile" << std::endl
	<< "For detailed help, run " << whoami << " --help" << std::endl
	<< std::endl;
    exit(EXIT_ERROR);
}
void usageExit(std::string const& msg)
{
    std::cerr
	<< std::endl
	<< whoami << ": " << msg << std::endl
	<< std::endl
	<< "Usage: " << whoami << " [options] infile outfile" << std::endl
	<< "For detailed help, run " << whoami << " --help" << std::endl
	<< std::endl;
    exit(EXIT_ERROR);
}