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/veracrypt/default.nix

@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, pkgconfig, yasm, fuse, wxGTK30, devicemapper, makeself,
+{ fetchurl, stdenv, pkgconfig, yasm, fuse, wxGTK30, lvm2, makeself,
   wxGUI ? true
 }:
 
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     '';
 
   nativeBuildInputs = [ makeself yasm pkgconfig ];
-  buildInputs = [ fuse devicemapper ]
+  buildInputs = [ fuse lvm2 ]
     ++ optional wxGUI wxGTK30;
   makeFlags = optionalString (!wxGUI) "NOGUI=1";