insert full pages at the end of the queue; only override page candidate if the page is not too full

test/test-stress.c

@@ -319,7 +319,7 @@ int main(int argc, char** argv) {
   mi_collect(true);
   #endif  
 #endif
-  //mi_stats_print(NULL);
+  mi_stats_print(NULL);
   //bench_end_program();
   return 0;
 }