[Nix-dev] Removing the old Haskell code

[Peter Simons]

Hi guys,

I've opened https://github.com/NixOS/nixpkgs/pull/7465 as an on-going effort
to remove all obsolete Haskell code from Nixpkgs. With those patches applied,
"haskellPackages" would be replaced by haskellngPackages, essentially. I would
like that switch to happen before 15.05 is finalized, i.e. within the next 2-3
weeks. If you still have code that depends on the old infrastructure, then now
is the time to switch to Haskell NG.

Best regards,
Peter