-iso-level 3 option to xorriso command, update_setup
script to match the all-in-one script, and also some things like
parted being launched twice during grub2-efi installation
2. Comment out all the i386-efi booting related functions in the all-in-one script.
3. Minor/Cosmetic changes in all-in-one script and the installer/setup script.
(ii) steve__ forum description highlighting archboot boot problems in MacMini
2ng Gen (32-bit efi - needs efi_uga grub2 module to be loaded which archboot did
not) and
(iii) using xorriso 1.0.4 's isohybrid option instead of calling isohybrid