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/applications/networking/browsers/firefox-bin/default.nix

@@ -5,7 +5,7 @@
 , curl
 , cups
 , dbus-glib
-, dbus_libs
+, dbus
 , fontconfig
 , freetype
 , gconf
@@ -93,7 +93,7 @@ stdenv.mkDerivation {
       curl
       cups
       dbus-glib
-      dbus_libs
+      dbus
       fontconfig
       freetype
       gconf