Broke evaluation of the nixos options.
The option `services.dysnomia' defined in `.../nixos/modules/rename.nix' does not exist.
This reverts commit 5c897b4eff.
- `localSystem` is added, it strictly supercedes system
- `crossSystem`'s description mentions `localSystem` (and vice versa).
- No more weird special casing I don't even understand
TEMP