experiment with config-package-dev to solve conflicts in whonix-shared-common package
- /etc/issue
- /etc/kde4/kdm/kdmrc
build-steps/1100_prepare-build-machine:
- install config-package-dev with debhelper support from debian testing (jessi) repository,
because its unfortunately not in debian wheezy
- only install apt-cacher-ng if not already installed to safe time when re-running the script
- check apt-cacher-ng status