Codeplex issue 191: inconsistent results from PDR engine. The report exposed bugs in the implementation of the priority queue leaving unexplored leaves durin search. The priority queue has now been revised to address the exposed bugs

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

src/test/main.cpp

@@ -224,6 +224,7 @@ int main(int argc, char ** argv) {
     TST(theory_pb);
     TST(simplex);
     TST(sat_user_scope);
+    TST(pdr);
     //TST_ARGV(hs);
 }