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/data/fonts/tipa/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation {
   };
 
   installPhase = ''
-    export PREFIX="$out/texmf"
+    export PREFIX="$out/texmf-dist"
     mkdir -p "$PREFIX" "$out/share"
     make install PREFIX="$PREFIX"