Re: Tease out independent components again.

[Chris Warburton]

After some more work, I think we should provide the following commands
to users (i.e. in the 'package' derivation):

 1) TIP to Haskell package (DONE: tipToHaskellPkg)
 2) Haskell package to ASTs (DONE: haskellPkgToAsts)
 3) QuickSpec ASTs (DONE: quickspecAsts)
 4) QuickSpec Haskell package (compose (2) and (3)) (DONE: quickspec)
 5) HashSpec ASTs to clusters (TODO)
 6) MLSpec ASTs to clusters (TODO)
 7) Clusters to equations, without reduction (DONE: concurrentQuickspec)
 8) Reduce equations (DONE: reduce-equations)

It probably makes sense to make commands for "hashspec Haskell package
to equations" and an "mlspec Haskell package to equations" as well;
they're not particularly needed, but it's a nicer UI if we have users
provide Haskell packages rather than ASTs. We should still provide the
AST-consuming versions, since users may want to mix and match what gets
sent in: for example, running `haskellPkgToAsts` on packages X, Y and Z,
using `jq` to pick out some functions, then sending them into *spec.

Note that all of the bucketing stuff can wait for now, so we actually
have all of the commands we need :)