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In particular, inline and simplify uses of add_with_carry/sub_with_borrow with a zero argument.

Toom multiplication can now be extracted

Add an example of use of clone_export.
Fix call to open_module.

         allows to remove completely some prover version

This is necessary so that rsymbols can be printed
consistently in Expr.

Also, Pretty.print_vs uses Ident.print_decoded now,
since variables can have operator names.

It is possible to append an arbitary number of quote symbols
at the end of an prefix/infix/mixfix operator:

            applied form      standalone form

              -' 42               (-'_)
              x +' y              (+')
              a[0]' <- 1          ([]'<-)

Pretty-printing will use the quote symbols for disambiguation.

The derived symbols can be produced by Why3 by appending
a suffix of the form "_toto" or "'toto". These symbols can
be parsed/printed as "(+)_toto" or "(+)'toto", respectively.

The code in file /src/util/pqueue.ml has been extracted from a Why3 proof,
and is now a correct-by-construction OCaml code. This file depends on the Vector
module, which is also an OCaml implementation extracted from another Why3 proof.
The proofs can be found in /examples/util/

This is the result of Aymeric Walch bachelor internship.

  use int.Int, set.Fset, ref.Ref
  (as updated in the pigeonhole.mlw file)

Any module name can be followed by a "as M" clause, but only a single "import"
is allowed. For instance:

  use import int.Int as I, map.Map as M

imports both Int and Map. To import Int but not Map, one would have to write

  use import int.Int as I
  use map.Map as M

This commit removes all hard-coded "infix ..", "prefix ..",
and "mixfix .." from the rest of the code, and handles the
symbolic notation entirely inside Ident. It does not change
the notation itself.

This allows (generalize->split->introduce) to stop
when the split transformation does not make progress.

      and fix one added recently

select_iter changes the cursor used by the goals_view for changing nodes
with keyboard arrow keys. selection#select_iter should be avoided alone.

See #151.
At the moment, this transformation is only integrated into TryWhy3,
in order to restore left-hand side splitting under vc:sp.

I suggest to integrate "generalize" into split_vc unconditionally.
I've tested that, the sessions were only broken for 4 examples:
  examples/tortoise_and_hare/
  examples/verifythis_2018_array_based_queuing_lock_2/
  examples/verifythis_2018_mind_the_gap_2/
  examples/multiprecision/toom/