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/misc/os-prober/default.nix

@@ -4,7 +4,7 @@ coreutils,  # mktemp
 grub2,      # grub-mount and grub-probe
 cryptsetup, # cryptsetup
 libuuid,    # blkid and blockdev
-libudev,    # udevadm udevinfo
+udev,    # udevadm udevinfo
 ntfs3g      # ntfs3g
 }:
 
@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
     done;
     for file in $out/bin/*; do
       wrapProgram $file \
-        --suffix PATH : ${stdenv.lib.makeBinPath [ grub2 libudev coreutils cryptsetup libuuid ntfs3g ]} \
+        --suffix PATH : ${stdenv.lib.makeBinPath [ grub2 udev coreutils cryptsetup libuuid ntfs3g ]} \
         --run "[ -d /var/lib/os-prober ] || mkdir /var/lib/os-prober"
     done;
   '';