add Univ.v#67
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- rename "P" into "Prf", "T" into "El", and "and" into "compose" to not clash with the builtin "and" used in why3 tactic - change types of tactic builtins by using universes to handle \tau and \pi uniformly (Deducteam/lambdapi-stdlib#67) - builtin.ml: factorize and simplify type checking of builtins, and add type checking of why3 tactic builtins - rewrite.ml: move builtin type checking to builtin.ml - enforce the declaration of builtins - doc on tacticals: update the types of builtins - tactic.ml: fix handling of "change" in tac_eval - move the contents of fol.ml into why3_tactic.ml - update stdlib files in tests/OK
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Some #tactics currently take arguments of type (\tau a) only while we would like them to take arguments of type (\pi a) as well, or vice versa. This PR introduces a simple notion of universe that I believe solves this problem. It also adds new builtins for the #tactics introduced recently: