Updating TeXLive to 2013 using updated Debian snapshots.

Kept the old hacks where they don't break the build in case they things
they fix are still relevant.

I checked that the upgrade doesn't break:
1) Asymptote and EProver builds.
2) My XeLaTeX demo from configurations/ repository.
3) Some of my own files.

The upgrade fixes problems with simultaneous use of 3D and LaTeX labels
in Asymptote.

Please provide a test that worked previously and is broken now if you
need to revert this update or its parts.

pkgs/development/libraries/harfbuzz/default.nix

@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, pkgconfig, glib, freetype, libintlOrEmpty }:
+{ stdenv, fetchurl, pkgconfig, glib, freetype,
+  icu ? null, graphite2 ? null, libintlOrEmpty }:
 
 stdenv.mkDerivation rec {
   name = "harfbuzz-0.9.12";
@@ -8,7 +9,12 @@ stdenv.mkDerivation rec {
     sha256 = "19cx5y2m20rp7z5j7mwqfb4ph2g8lrri69zim44x362y4w5gfly6";
   };
 
-  buildInputs = [ pkgconfig glib freetype ] ++ libintlOrEmpty;
+  buildInputs = [ pkgconfig glib freetype ]
+    ++ libintlOrEmpty;
+  propagatedBuildInputs = []
+    ++ (stdenv.lib.optionals (icu != null) [icu])
+    ++ (stdenv.lib.optionals (graphite2 != null) [graphite2])
+    ;
 
   meta = {
     description = "An OpenType text shaping engine";