* ospf_lsa.h: New flag to the LSA structure for the SPF calculation.
	* ospf_lsdb.h: Export ospf_lsdb_clean_stat() function.
	* ospf_spf.h: Add link to the LSA stat structure into vertex.
	* ospf_spf.c: New functions cmp() and update_stat() to manage
	  candidates. Remove ospf_spf_has_vertex(), ospf_vertex_lookup(),
	  ospf_install_candidate() and ospf_spf_register() functions not needed
	  any more. Update ospf_vertex_new(), ospf_spf_next() and
	  ospf_spf_calculate() functions to use pqueue instead of linked list.
diff --git a/ospfd/ospf_lsdb.c b/ospfd/ospf_lsdb.c
index 94d839f..56ab9e2 100644
--- a/ospfd/ospf_lsdb.c
+++ b/ospfd/ospf_lsdb.c
@@ -180,6 +180,23 @@
     }
 }
 
+void
+ospf_lsdb_clean_stat (struct ospf_lsdb *lsdb)
+{
+  struct route_table *table;
+  struct route_node *rn;
+  struct ospf_lsa *lsa;
+  int i;
+
+  for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
+    {
+      table = lsdb->type[i].db;
+      for (rn = route_top (table); rn; rn = route_next (rn))
+	if ((lsa = (rn->info)) != NULL)
+	  lsa->stat = LSA_SPF_NOT_EXPLORED;
+    }
+}
+
 struct ospf_lsa *
 ospf_lsdb_lookup (struct ospf_lsdb *lsdb, struct ospf_lsa *lsa)
 {