Actual proofs will end up using own and inv, and none of the notions defined in ownership.v

No idea why these aren't resolved automatically, for unary predicates
they do not seem necesarry.

* Insert and singleton operation.
* Identity element.
* Non-expansiveness and properness of insert and singleton.
* Frame preserving updates.
* Functoriality.

Everything has been re-written from scratch

We should not depend on unreleased, git-only versions.
This reverts commit ee948028.