refactor(pacman): manage /etc/pacman.conf by ovewriting
refactor(pacman): manage /etc/pacman.conf by ovewriting

No need to use an ini module for this. Any time the system wants to
update /etc/pacman.conf it will create /etc/pacman.conf.pacnew and I can
easily diff it from there, as I already did a few commits back in
78d179c5.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent