add moreutils, we need ifdata when using static IP configuration
use ifdata to get IP parameters
move from aprrox to apt-cacher-ng
remove approx config
disable FAI repository by default

I've read this mail
https://lists.uni-koeln.de/pipermail/linux-fai/2013-December/010261.html
remove option -G
fix typo
minor fixes
add code for using an apt proxy by adding variable APTPROXY
faiserver whould use its own apt cache
make beta