NixOS 16.09 is called Flounder

chosen by @zimbatm as our documentation hero in 16.03

nixos/modules/misc/version.nix

···
       nixosVersion = mkDefault (maybeEnv "NIXOS_VERSION" (cfg.nixosRelease + cfg.nixosVersionSuffix));
 
       # Note: code names must only increase in alphabetical order.
-      nixosCodeName = "Emu";
+      nixosCodeName = "Flounder";
     };
 
     # Generate /etc/os-release.  See