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This commit adds parsing for boolean expression and floating point value
which are returned by z3 on the last version. This adds floating point
values in the collected data and JSON printed data. This does not add
boolean expressions because it does not add information.
Also added transformation eliminate epsilon in driver for Z3 ce.

* drivers/z3_gnatprove_ce.drv
(eliminate_epsilon): Added transformation eliminate epsilon in driver for
counterex for z3.

* src/core/model_parser.ml
(float_type): Added a float_type and functions to send it as JSON data.

* src/driver/collect_data_model.ml
(convert_array_value): Explicit matching for error handling when adding
constructs.
(convert_float): Dummy conversion of float_type to avoid circular
dependency.

* src/driver/parse_smtv2_model_lexer.mll
(token): Adding z3 specific boolean expressions. Also adding a way to
parse all floating point value including those we don't want to print
because we need to parse them even if we don't want to print them.

* src/driver/parse_smtv2_model_parser.mly
(smt_term): Adding floating point value case which is handled in the lexer.
Added boolean_expression case.

* src/driver/smt2_model_defs.ml
(float_type): Adding a duplicated float_type for dependencies reasons.
(print_float): Debugging print of float_type.
(): Adding cases for float in remaining functions.

Change-Id: I5baee2880a9843f0fec61b1bf3edb2a2f3e54bd1

Change-Id: Id165717756375db150031589740470cc1e08b8ac

This commit allows parsing of the result of get-model from smtsolvers.
It changes the communication between why3 and Spark for CE to communicate
records and array as JSON values.

 * src/core/model_parser.ml
(model_value): Adding boolean and record type to model values.
(print_*): Changed printing functions to print arrays and records as JSON
values not as strings.

 * src/driver/collect_data_model.ml
(get_variables_*): collect all internal variables of a term and put them
into a map.
(add_all_cvc): Add all cvc4 variables in the model to a global map.
(add_vars_to_table): Add values of variables that can be deduced from ITE
 to the table.
(corres_else_element): Take the definitions of functions to_rep/of_rep
and extract the values of internal CVC variables from it.
(refine_*): Recursively replace internal variables in a term with values
taken from the table.
(convert_*): Convert to type model_value from model_parser.ml.
(create_list): Combine the following to get a list of model_value from
the parsing of the model.

* src/driver/parse_smtv2_model.ml
(parse): Changed the detected end of model.

* src/driver/parse_smtv2_model_lexer.mll
(rule): Added tokens related to model definitions and SPARK definitions of
records, discriminants and ref.

* src/driver/parse_smtv2_model_parser.mly
(output): Changed the parser so that it can parse a model as returned by
Cvc4 or z3.

* src/driver/smt2_model_defs.ml
(print_*): Added printing functions for terms.
(make_local*): Changes the AST of terms to differentiate smtsolver
internal variables, user-defined variables and local variables.
(subst*): Removes the local let bindings introduced by z3.
(build_record_discr): Put definitions of discriminants inside the record
definition.

 * src/printer/smtv2.ml
(print_logic_decl): Removed get-values and added get-model.

* src/transform/intro_projections_counterexmp.ml
(intro_const_equal_to_term): Only allow projections for attributes first,
last and field projections. Necessary when the field of a record is
itself on array on which we want to get First and Last.

* src/transform/intro_vc_vars_counterexmp.ml
(do_intro): Some definitions moved to intro_projections_counterexmp.ml.

Change-Id: Ib77fb66a2f7c53a9f54cfc300c8984e1fcec8087