functorizing the code to avoid multiple names for the same module.
a trivial prover.
don't make this opaque.
adding the Bedrock cancelation algorithm.
a few tweaks to the CancelTacBedrock interface.
reification of partial function applications.
adding abstracted versions of exprD and sexprD.
fixing bug in the unfolder interface.
a few more tactic definitions and lemmas.
evaluation microbenchmark.
pulling apart Lemma and SepLemma.
these files are dead for the moment.

- they won't even compile.
removing debug printing during hint development.
getting rid of the reification selection targets.