Fix comments.
Added a path class.
Implement more enriched transitions for importing.

Now you can import a clause of an enriched AND into the kth clause of
any contained Conj.
You can import a clause of an AND into All the clauses of a contained OR
or WITH clause.
Fix bugs.
Add some files, fix bugs.
Add an enriched forwardAssociateOut method.
Merge branch 'path-import' into about
Implement importables.

The code still needs to be tested.  This commit just puts forth the
rough draft.
Finish implementation of the importables classes.

Importables will still not actually be useful until we have some
interesting functions for creating them and ways of generating useful
ClaimsUse objects.
Implement some functions for creating importables.
Fix bug and run the first few imports using about.
Implement forwardClean to remove trivialities from formulas.
Test and fix bugs in using about.

The easy_induction proof has now been completed with heavy use of the
about functionality.  The length, difficulty, and tedium of the proof
have all been dramatically decreased.  The proof still compiles and runs
correctly.
Replace easy_induction with new_easy_induction.
Fix typo in README.
Merge branch 'dev' into about
Fix typo in README.
Merge branch 'dev' into about
Merge branch 'about' into dev
Implement compression of enriched arrows.

To aid with compressing, implement an enriched OnValues arrow to
generalize the enriched OnIth arrows.  The OnValues arrows allow us to
leverage the commutivity of the OnIth arrows for different indices.