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Also:

- Remove the wp_strip_later hack.
- Let wp_lam, wp_rec, wp_... initiate the proof mode.

Really, *all* of our files contain proof rules

Thanks to Robbert for fixing gen_heap

Use COFEs only for the recursive domain equation solver

This way we avoid the env_cbv tactic unfolding string related stuff
that appears in the goal and hypotheses of the proof mode.

And also rename the corresponding proof mode tactics.

rename program_logic.{ownership -> wsat}. It really is about world satisfaction and invariants more than about ownership.

Used in iRevert, iClear, iFrame, and for generalizing the IH in
iInduction and iLöb.