Describe where /etc/nix/nix.conf settings come from
Document that extraUsers options apply to root
Fix typos, especially those that end up in the NixOS manual
nixos-rebuild: support -vv, -vvv, -vvvv, and -vvvvv
Merge pull request #214 from ivan/typo-fix-1

Fix typos, especially those that end up in the NixOS manual
Merge pull request #215 from ivan/nixos-rebuild-vvvvv

nixos-rebuild: support -vv, -vvv, -vvvv, and -vvvvv
Merge pull request #212 from ivan/nix-conf-header

Describe where /etc/nix/nix.conf settings come from
Merge pull request #213 from ivan/extraUsers-root

Document that extraUsers options apply to root
Subversion repos stopped updating last year
Explain how to use /my/sources with nix-env, not just nixos-rebuild
Merge pull request #216 from ivan/hacking-on-nixos

"Hacking on NixOS": Explain how to use /my/sources with nix-env
Unbreak iso_efi by feeding it a kernel that exists.
info program: use latest texinfo