replace restore_size_trail by more generic restore_vector

other updates:
- change signature of advance_qhead to simplify call sites
- have model reconstruction replay work on a tail of dependent_expr state, while adding formulas to the tail.

src/sat/sat_solver.h

@@ -485,6 +485,7 @@ namespace sat {
         // -----------------------
     public:
         lbool check(unsigned num_lits = 0, literal const* lits = nullptr);
+        lbool check(literal_vector const& lits) { return check(lits.size(), lits.data()); }
 
         // retrieve model if solver return sat
         model const & get_model() const { return m_model; }