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Johannes, Yannick: yes this is what you think (good news)
but this is not yet completed (bad news)

(we do not have to use the ghost construct here, but it looks nicer)

But:
 - problem with BuiltIn, Bool, Tuple, Unit and theory
 - work only with "why" and "whyml" files format

warning for possibly useless quantifiers (unless a leading underscore is used)

Remove the incorrect Coq realization of PowerReal.pow by Rpower, since the
latter is only meaningfully defined for positive first arguments, e.g.
Rpower (-1) 3 = 1!

Replaying programs/vacid_0_binary_heaps/proofs ... FAILED (ret code=1): 37/38 (replay failed)
   goal 'WP_parameter heapSort.10', prover 'Eprover (1.4)': Timeout (9.97s) instead of Valid (2.93s) (timelimit=10)
   goal 'Is_heap_when_no_element', prover 'Spass (3.7)': Timeout (13.00s) instead of Valid (5.61s) (timelimit=13)

Locations and labels were leaking into constant definitions, thus
preventing TPTP provers to unify them when equal. Example:
const_shdqproofssldtdtsltest_harnessdtmlwdq_17_23_24sh_3 <> const_3.

Remove axioms from int.Power realization.

Add monoids to the algebraic hierarchy.