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/glib/default.nix

@@ -4,7 +4,8 @@
 , utillinuxMinimal ? null
 
 # this is just for tests (not in closure of any regular package)
-, coreutils, dbus_daemon, libxml2, tzdata, desktop-file-utils, shared-mime-info, doCheck ? false
+, coreutils, dbus, libxml2, tzdata, desktop-file-utils
+, shared-mime-info, doCheck ? false
 }:
 
 with stdenv.lib;
@@ -121,7 +122,7 @@ stdenv.mkDerivation rec {
     export XDG_RUNTIME_HOME="$TMP"
     export HOME="$TMP"
     export XDG_DATA_DIRS="${desktop-file-utils}/share:${shared-mime-info}/share"
-    export G_TEST_DBUS_DAEMON="${dbus_daemon.out}/bin/dbus-daemon"
+    export G_TEST_DBUS_DAEMON="${dbus.daemon}/bin/dbus-daemon"
     export PATH="$PATH:$(pwd)/gobject"
     echo "PATH=$PATH"