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/keybase/gui.nix

@@ -4,16 +4,16 @@
 , runtimeShell, gsettings-desktop-schemas }:
 
 let
-  versionSuffix = "20190612201656.952fee6c59";
+  versionSuffix = "20190813132700.6f497ec371";
 in
 
 stdenv.mkDerivation rec {
   pname = "keybase-gui";
-  version = "4.1.0"; # Find latest version from https://prerelease.keybase.io/deb/dists/stable/main/binary-amd64/Packages
+  version = "4.3.1"; # Find latest version from https://prerelease.keybase.io/deb/dists/stable/main/binary-amd64/Packages
 
   src = fetchurl {
     url = "https://s3.amazonaws.com/prerelease.keybase.io/linux_binaries/deb/keybase_${version + "-" + versionSuffix}_amd64.deb";
-    sha256 = "0jwxw75yz7sbvfqw2aksa3p7jlcv817743fl59qk6rq1x9ag6qpx";
+    sha256 = "1mbbfy1aijqr8209jjja6dm2nzw721qqw94839df047rcwnd38pg";
   };
 
   nativeBuildInputs = [