additional robustness check for incremental sat solver core when it recieves interpreted constants, added PB equality to interface and special handling of equalities to adddress performance gap documented in #755

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/solver/solver2tactic.h

@@ -0,0 +1,30 @@
+/*++
+Copyright (c) 2016 Microsoft Corporation
+
+Module Name:
+
+    solver2tactic.h
+
+Abstract:
+
+    Convert solver to a tactic.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2016-10-17
+
+Notes:
+   
+--*/
+#ifndef SOLVER2TACTIC_H_
+#define SOLVER2TACTIC_H_
+
+#include "tactic.h"
+#include "filter_model_converter.h"
+class solver;
+
+tactic * mk_solver2tactic(solver* s);
+
+void extract_clauses_and_dependencies(goal_ref const& g, expr_ref_vector& clauses, ptr_vector<expr>& assumptions, obj_map<expr, expr*>& bool2dep, ref<filter_model_converter>& fmc);
+
+#endif