nsis-installer: Use custom page for shortcuts and install for all users. * binary-dist-rules.mk: copy installer-files/README.html to dist folder. * installer-files/README.html: New file. * makeinst-script.sh: Added custom page for Install for all users and Create shortcuts. Reassigned show readme checkbox for showing README.html at end of install. Run octave-gui as the Run program.

#include <iostream>
#include <cpp/poppler-version.h>

int main(int argc, char *argv[])
{
    (void)argc;
    (void)argv;

    std::cout << "Poppler version: " << poppler::version_string() << std::endl;

    return 0;
}