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Conflicts:
	doc/manpages.tex

Merge branch 'counter-examples' of git+ssh://scm.gforge.inria.fr//gitroot/why3/why3 into counter-examples

Fastwp now adds VC explanation labels in the same way as the regular WP.
That was an oversight of existing implementation.

A poorly successful attempt to check consistency of bv theory with SMTLIB, using a kind of "SMT realization"

In a counterexample model returned by cvc4, values can be also of the form
"(mk_t__ref([0-9]*) (value))", while only the form "(mk_t__ref (value))"
was supported.

* src/driver/parse_smtv2_model_lexer.mll
MK_T__REF can be of the form "mk_t__ref([0-9]*)".

Enabling the transformation detect_polymorphism caused some variables be
of reference type and their values outputed in the form "mk_t__ref value".
This was not recognized by the counterexample model parser.

* src/driver/parse_smtv2_model_lexer.mll
Add new token corresponding to string "mk_t__ref"

* src/driver/parse_smtv2_model_parser.mly
Value can be also of the form "(mk_t__ref value)"

So that it can be used to search for other labels.

* termcode.ml
(search_labels): basically a copy of get_expls_fmla with extra argument
for the callback
(get_expls_fmla): rewritten to use search_labels

Merge branch 'counter-examples' of git+ssh://scm.gforge.inria.fr//gitroot/why3/why3 into counter-examples

So that it can be used to search for other labels.

* termcode.ml
(search_labels): basically a copy of get_expls_fmla with extra argument
for the callback
(get_expls_fmla): rewritten to use search_labels

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.