We already do the same for the goal, this avoids some scope
delimiters being displayed.

* move PROP-envs definitions to environments.v so that we can control them without pulling in coq_tactics
* use reduction-controlled `pm_default` for proofmode accessors

If the BI is not affine, this should not happen, as it may lead to
information loss.

This commit fixes issue #190.

move test suite out of theories/ so it does not get installed; also check output of test suite so that we can test printing