[arch-dev-public] official installation guide maintained in git, wiki is just an export

for those of you who did not know yet: do not make edits to the wiki source directly @ http://wiki.archlinux.org/index.php/Official_Arch_Linux_Install_Guide rather, send changes to me. See summary block on the top right for more info. I will be updating the files in git to reflect what people have done to the wiki, but this is double work, so should be avoided. Dieter