[arch-releng] [RFC] Finalized work about install_dir

All this work is in my install_dir branch (based on experimental). Tested and works. http://github.com/djgera/archiso/compare/experimental...install_dir Today images sizes: (*dual build with -T split, otherwise core-dual is 725M and net-dual 355M): 666M archlinux-2010.10.21-core-dual.iso 357M archlinux-2010.10.21-core-i686.iso 374M archlinux-2010.10.21-core-x86_64.iso 297M archlinux-2010.10.21-netinstall-dual.iso 176M archlinux-2010.10.21-netinstall-i686.iso 185M archlinux-2010.10.21-netinstall-x86_64.iso