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Coq printer.
Also adding the "pretty-printed" generated realization.



N604-045 Coq code easier to read

* src/printer/coq.ml
Added indentation in Why3's Coq printer using the OCaml Format pretty
printing module.
Changed the display of logic formulas and terms only.

(cherry picked from commit 3453a65e0e5fca7e3aa16e22915ee3f079daf1c6)

Conflicts:
	src/printer/coq.ml
	src/transform/gnat_split_conj.ml

- update Coq and Isabelle realizations (TODO: PVS)

From Max_is_some and Max_is_ge, one can prove that ge is a total relation.
So the consequents hold even if "ge x y" does not (since "ge y x" then
holds by totality).

 - use the syntax of the driver for the own realization of a theory
 - add a *_def lemma for defined logics with syntax
 - add comments that inform which syntax is used for declared logic