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/tools/package-management/nixops/generic.nix

@@ -1,4 +1,4 @@
-{ lib, python2Packages, fetchurl, libxslt, docbook5_xsl, openssh
+{ lib, python2Packages, fetchurl, libxslt, docbook_xsl_ns, openssh
 # version args
 , src, version
 }:
@@ -31,7 +31,7 @@ python2Packages.buildPythonApplication {
   doCheck = false;
 
   postInstall = ''
-    make -C doc/manual install nixops.1 docbookxsl=${docbook5_xsl}/xml/xsl/docbook \
+    make -C doc/manual install nixops.1 docbookxsl=${docbook_xsl_ns}/xml/xsl/docbook \
       docdir=$out/share/doc/nixops mandir=$out/share/man
 
     mkdir -p $out/share/nix/nixops