NixOS - Activate acpi
NixOS - pmount asks to be a setuid program for the user to be able to
use it simply (without sudo)
NixOS - Start gpg agent
NixOS - Remove useless comments
NixOS - Refactor to improve readability
NixOS - Add comments
NixOS - Start gnupg agent instead of ssh-agent
NixOS - pumount setuid
NixOS - Reference other missing default software