add libpaper
ghostscript: minor update, replace more internal libraries by nix ones
Merge pull request #289 from vcunat/vlada/ghost

GhostScript
add glu library from mesa, needed e.g. for SDL

It provides the includes/GL/glu.h file.
SDL: minor update, fix OpenGL support, change some flags from Gentoo
Hide package sets for GHC 6.10.4, 6.12.3, 7.0.4, 7.4.1, and 7.6.1 from nix-env
(and from Hydra). It is still possible to install any of those packages by
referring to them by attribute:

 | $ nix-env -iA haskellPackages_ghc6104.hopenssl --dry-run
 | (dry run; not doing anything)
 | installing `haskell-hopenssl-ghc6.10.4-1.6.1'
 | these paths will be fetched (50.61 MiB download, 450.34 MiB unpacked):
 |   /nix/store/rjsgga1fdqin47n2rkfn9l7v9ncsfh9l-haskell-hopenssl-ghc6.10.4-1.6.1
 |   /nix/store/y567qhqbjxbkldg3kq2clzn52a56cmdn-haskell-mtl-ghc6.10.4-1.1.0.2
 |   /nix/store/zbn24z1443fbrx6ch1nn2vnss9bdw1g0-ghc-6.10.4

It's no longer possible to install those by name anymore, though:

 | $ nix-env -i haskell-hopenssl-ghc6.10.4
 | error: selector `haskell-hopenssl-ghc6.10.4' matches no derivations

That style works only for active GHC versions 7.4.2 and 7.6.2:

 | $ nix-env -qaP \* | grep  haskell-hopenssl
 | haskellPackages.hopenssl                          haskell-hopenssl-ghc7.4.2-1.6.1
 | haskellPackages_ghc742_no_profiling.hopenssl      haskell-hopenssl-ghc7.4.2-1.6.1
 | haskellPackages_ghc742_profiling.hopenssl         haskell-hopenssl-ghc7.4.2-1.6.1-profiling
 | haskellPackages_ghc762.hopenssl                   haskell-hopenssl-ghc7.6.2-1.6.1

These changes intend to ease the load on Hydra. If you desperately need
pre-build binaries of any of those old versions, please post a short note
on the nix-dev mailing list.

Now in x-updates as well.

Conflicts (auto-solved):
	pkgs/top-level/all-packages.nix
ghostscript: fix infinite recursion in meta (sorry for that)
Merge commit 'refs/top-bases/vlada/libpng' into vlada/libpng

Conflicts (taken the stuff previously comitted to x-updates):
	pkgs/development/libraries/libpaper/default.nix
	pkgs/misc/ghostscript/default.nix
	pkgs/top-level/all-packages.nix
unify intltool

IMHO:
	- It's no longer GNOME package.
	- It seems best for everyone to use the newest version.