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/misc/digitalbitbox/default.nix

@@ -7,7 +7,7 @@
 , libevent
 , libtool
 , libqrencode
-, libudev
+, udev
 , libusb
 , makeWrapper
 , pkgconfig
@@ -67,12 +67,12 @@ in stdenv.mkDerivation rec {
     qttools
   ];
 
-  buildInputs = with stdenv.lib; [
+  buildInputs = [
     # TODO: remove libcap when pruneLibtoolFiles applies to pulseaudio.
     libcap
     libevent
     libtool
-    libudev
+    udev
     libusb
     libqrencode