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supported options of 'why3 session info: --stats, --graph, --provers
not supported: --tree, --edited-files, --dir

Add a name_table in printer_args.
Put the definition of name_table in task.ml.
Build_name_tables only called once in proof_node creation.
Modified the rest accordingly.

When Why3 is run on a file where some theories have been suppressed, it
will delete the corresponding theories from the session file.  We now
add an option keep_unmatched_theories to Session.update_session, which
keeps all theories. In this commit, this option is always disabled.

This is useful for SPARK, which sometimes only generates part of the
Why3 file for efficiency reasons, but doesn't want the session file to
be damaged because of that.

* session.ml
(import_theory)
(import_goal)
(import_proof_attempt)
(import_transf): new functions to copy a session tree from an old
  session file
(merge_file): keep old theories when keep_unmatched_theories is true
* session_scheduler.ml
(update_session): pass keep_unmatched_theories
* why3session_lib.ml
(read_update_session): pass keep_unmatched_theories

makes API of Call_provers and Driver a bit simpler

When resource limit is hit, cvc4 outputs useless counterexample. Query
cvc4 for the reason of answer unknown and use the answer to decide
whether resource limit was hit. If it was hit, do not display the
counterexample.

* src/driver/call_provers.{ml|mli}
(parse_prover_run): If the prover answers unknown, get the information
about the reason of this answer.

* src/printer/smtv2.ml
(print_prop_decl): Query solver for the reason of answer unknown.

* src/driver/driver.ml
(load_driver): Initialize Unknown with no information about the reason
of answer unknown.

* src/session/session.ml
(load_result): Initialize Unknown with no information about the reason
of answer unknown.

* src/session/session_scheduler.ml
(schedule_proof_attempt)
(edit_proof): Initialize Unknown with no information about the reason
of answer unknown.

* src/why3session/why3session_lib.ml
(filter_spec): Initialize Unknown with no information about the reason
of answer unknown.

on the command line (for the "replay" command)

This is to avoid recurrent replay error from Alt-Ergo, that does
not reliably replay a proof with the same number of steps

              when one of the field is empty.

              (Thx Jean-Christophe)

If these are set, the prover is asked for counter-example and if the counter-example is got, it is displayed.

+ fixed wrong step limit in one session

(no yet displayed in IDE)