treewide: remove aliases in nixpkgs

This makes the command ‘nix-env -qa -f. --arg config '{skipAliases =
true;}'’ work in Nixpkgs.

Misc...

- qtikz: use libsForQt5.callPackage

  This ensures we get the right poppler.

- rewrites:

  docbook5_xsl -> docbook_xsl_ns
  docbook_xml_xslt -> docbook_xsl

diffpdf: fixup

pkgs/development/libraries/libgnome-keyring/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, glib, dbus_libs, libgcrypt, pkgconfig,
+{ stdenv, fetchurl, glib, dbus, libgcrypt, pkgconfig,
 intltool }:
 
 stdenv.mkDerivation {
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
 
   outputs = [ "out" "dev" ];
 
-  propagatedBuildInputs = [ glib dbus_libs libgcrypt ];
+  propagatedBuildInputs = [ glib dbus libgcrypt ];
   nativeBuildInputs = [ pkgconfig intltool ];
 
   meta = {