[GLOP] add solution polishing to increase its integrality; [CP-SAT] new stats exported, fix java samples, add quick_restart_no_lp to search diversification

ortools/sat/samples/SimpleSatProgram.java

@@ -49,7 +49,7 @@ public class SimpleSatProgram {
     CpSolverStatus status = solver.solve(model);
     // [END solve]
 
-    if (status == CpSolverStatus.FEASIBLE) {
+    if (status == CpSolverStatus.OPTIMAL) {
       System.out.println("x = " + solver.value(x));
       System.out.println("y = " + solver.value(y));
       System.out.println("z = " + solver.value(z));