remove old version 0.4.2
Merge https://github.com/vitamins/archinstaller
* add proper date to the file's header
* simplify error checks
* use case statements instead of elif
* improved error checking of all xorg variables
* rename variable graphical_boot to graphical_login
* rename display manager options to: gdm,kdm,lxdm,xdm
* fix an error in ari.conf.example, where desktop_environment was set to lxdm