Add cvc4 1.6 driver

why3mods/cvc4_16_nobv.drv

+(** Why3 driver for CVC4 >= 1.6 (with floating point support) *)
+
+prelude ";; produced by cvc4_16.drv ;;"
+prelude "(set-info :smt-lib-version 2.6)"
+prelude "(set-logic AUFFPDTNIRA)"
+(*
+    A    : Array
+    UF   : Uninterpreted Function
+    FP   : FloatingPoint
+    DT   : Datatypes
+    NIRA : NonLinear Integer+Real Arithmetic
+*)
+
+import "smt-libv2.gen"
+printer "smtv2.6"
+import "no-bv.gen"
+import "smt-libv2-floats.gen"
+import "discrimination.gen"
+
+transformation "inline_trivial"
+transformation "eliminate_builtin"
+transformation "detect_polymorphism"
+transformation "eliminate_definition_if_poly"
+transformation "eliminate_inductive"
+transformation "eliminate_algebraic_if_poly"
+transformation "eliminate_literal"
+transformation "eliminate_epsilon"
+transformation "simplify_formula"
+
+(* Prepare for counter-example query: get rid of some quantifiers
+   (makes it possible to query model values of the variables in
+   premises) and introduce counter-example projections.  Note: does
+   nothing if meta get_counterexmp is not set *)
+transformation "prepare_for_counterexmp"
+
+transformation "discriminate_if_poly"
+transformation "encoding_smt_if_poly"
+
+(** Error messages specific to CVC4 *)
+
+outofmemory "(error \".*out of memory\")\\|Cannot allocate memory"
+timeout "interrupted by timeout"
+steps "smt::SmtEngine::resourceUnitsUsed, \\([0-9]+.?[0-9]*\\)" 1
+(**
+Unfortunately, there is no specific output message when CVC4 reaches its resource limit
+steplimitexceeded "??"
+*)
+
+
+(** Extra theories supported by CVC4 *)
+
+(* CVC4 division seems to be the Euclidean one, not the Computer one *)
+theory int.EuclideanDivision
+  syntax function div "(div %1 %2)"
+  syntax function mod "(mod %1 %2)"
+  remove prop Mod_bound
+  remove prop Div_mod
+  remove prop Mod_1
+  remove prop Div_1
+end
+
+(*
+theory int.ComputerDivision
+  syntax function div "(div %1 %2)"
+  syntax function mod "(mod %1 %2)"
+  remove prop Mod_bound
+  remove prop Div_mod
+  remove prop Mod_1
+  remove prop Div_1
+end
+*)
+