Add Guile config
emacs: switch to use-package

Massive change! And also some cleanup to remove old and unused packages...
systemd: add dnssec-trigger-panel

As per http://schnouki.net/posts/2014/03/30/dnssec-trigger-on-arch-linux-without-network-manager/
emacs: fix some use-package errors
emacs: move Python-specific stuff to a separate file

And simplify it A LOT.
zsh: enhance completion
notmuch: fix spam handling with notmuch 0.18
emacs: add ack aliases
zsh: fix reload_local_completion for symlinks
emacs: use bind-key
emacs: enhance Pelican services
zsh: add git-annex completion
urxvt: update tabbedex to the latest version in my branch