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/os-specific/linux/pm-utils/default.nix

@@ -1,10 +1,10 @@
 { stdenv, fetchurl, coreutils, gnugrep, utillinux, kmod
-, procps, kbd, dbus_tools }:
+, procps, kbd, dbus }:
 
 let
 
   binPath = stdenv.lib.makeBinPath
-    [ coreutils gnugrep utillinux kmod procps kbd dbus_tools ];
+    [ coreutils gnugrep utillinux kmod procps kbd dbus ];
 
   sbinPath = stdenv.lib.makeSearchPathOutput "bin" "sbin"
     [ procps ];