Drop support for Debian wheezy It's oldoldstable nowadays and we no longer use it anywhere, so let's drop related zsh completion and config files.
Fix apt 1.1 regression in apt-preferences handling apt >=1.1 fails to parse our apt-preferences setup: | E: Invalid record in the preferences file /etc/apt/preferences, no Package header
Fixes to be able to build Grml based on Debian Wheezy In Debian Wheezy initramfs-tools is 0.109, but the Grml kernel needs at least 0.110. The backport contains the requested version.