Merge branch 'master' into staging

Conflicts:
	nixos/doc/manual/release-notes/rl-unstable.xml
	nixos/modules/services/printing/cupsd.nix
	pkgs/applications/misc/calibre/default.nix
	pkgs/development/haskell-modules/hackage-packages.nix
	pkgs/development/libraries/libsodium/default.nix
	pkgs/misc/emulators/wine/unstable.nix
	pkgs/top-level/all-packages.nix