void usage()
{
    std::cerr << "Usage: " << whoami << " infile.pdf outfile.pdf [in-password]"
	      << std::endl
	      << "Double size of all pages in infile.pdf;"
	      << " write output to outfile.pdf" << std::endl;
    exit(2);
}
void usage()
{
    std::cerr << "Usage: " << whoami << " infile.pdf outfile.pdf [in-password]"
	      << std::endl
	      << "Double size of all pages in infile.pdf;"
	      << " write output to outfile.pdf" << std::endl;
    exit(2);
}