Merge branch 'master' into staging-next

There ver very many conflicts, basically all due to
name -> pname+version.  Fortunately, almost everything was auto-resolved
by kdiff3, and for now I just fixed up a couple evaluation problems,
as verified by the tarball job.  There might be some fallback to these
conflicts, but I believe it should be minimal.

Hydra nixpkgs: ?compare=1538299

pkgs/tools/security/nmap/default.nix

@@ -20,11 +20,11 @@ let
 
 in stdenv.mkDerivation rec {
   name = "nmap${optionalString graphicalSupport "-graphical"}-${version}";
-  version = "7.70";
+  version = "7.80";
 
   src = fetchurl {
     url = "https://nmap.org/dist/nmap-${version}.tar.bz2";
-    sha256 = "063fg8adx23l4irrh5kn57hsmi1xvjkar4vm4k6g94ppan4hcyw4";
+    sha256 = "1aizfys6l9f9grm82bk878w56mg0zpkfns3spzj157h98875mypw";
   };
 
   patches = [ ./zenmap.patch ]