Major Description
This feature is needed in particular if we want to have our .isos starting on UEFI systems. Needed by alex_ionescu who is currently working on UEFI boot.
Documentation:
https://fedoraproject.org/wiki/User:Pjones/BootableCDsForBIOSAndUEFI
http://bazaar.launchpad.net/~libburnia-team/libisofs/scdbackup/view/head:/doc/boot_sectors.txt (alternately http://fossies.org/linux/xorriso/doc/boot_sectors.txt )
http://download.intel.com/support/motherboards/desktop/sb/specscdrom.pdf : El-Torito specifications.
https://msdn.microsoft.com/en-us/library/Hh824847.aspx
https://support.microsoft.com/en-us/kb/947024
http://www.syslinux.org/wiki/index.php/Isohybrid