empty now), do more of bashrc.sh declaratively, and moved nsswitch
generation to modules/config/nsswitch.nix.
svn path=/nixos/branches/modular-nixos/; revision=15754
into a NixOS module (modules/system/activation/top-level.nix -
couldn't think of a better name). The top-level derivation is
returned in config.system.build.system.
* Inlined system.sh in top-level.nix so that we don't have to pass
everything through environment variables.
svn path=/nixos/branches/modular-nixos/; revision=15740