Failure to build with GHC >= 7.7

[bos]

There are so many deps that cabal's depsolver gives up before it can report anything meaningful, but here's what I have:

cabal: Could not resolve dependencies:
trying: category-extras-1.0.2 (user goal)
trying: representable-functors-3.2.0.1 (dependency of category-extras-1.0.2)
trying: mtl-2.1.2 (dependency of representable-functors-3.2.0.1)
trying: pointed-3.1 (dependency of category-extras-1.0.2)
next goal: indexed-extras (dependency of category-extras-1.0.2)
rejecting: indexed-extras-0.1.1 (conflict: pointed==3.1, indexed-extras =>
pointed<2.2)
rejecting: indexed-extras-0.1 (conflict: mtl==2.1.2, indexed-extras =>
mtl<2.1)
Backjump limit reached (change with --max-backjumps).

[ekmett]

I think this forwarding package has served its purpose. I'll remove the superclass dependencies and just use the new hackage 2 deprecation notice to link to everything that it has been split into.