implement flag edge-weight-updates-over-factor, to log edge weight

updates over provided x factor

include/contractor/contractor.hpp

@@ -89,7 +89,8 @@ class Contractor
                           const std::string &geometry_filename,
                           const std::string &datasource_names_filename,
                           const std::string &datasource_indexes_filename,
-                          const std::string &rtree_leaf_filename);
+                          const std::string &rtree_leaf_filename,
+                          const double log_edge_updates_factor);
 };
 }
 }

include/contractor/contractor_config.hpp

@@ -73,6 +73,7 @@ struct ContractorConfig
     bool use_cached_priority;
 
     unsigned requested_num_threads;
+    double log_edge_updates_factor;
 
     // A percentage of vertices that will be contracted for the hierarchy.
     // Offers a trade-off between preprocessing and query time.