separate src folder

src/graph.cpp

@@ -200,6 +200,7 @@ void Graph::reset_forest()
    for(auto & node : _nodes) {
       node.ear_or_root_neighbor = cur_id;
       node.root_of_ear_component = cur_id;
+      node.scanned = false;
       // Note that we do not change the matching itself here
       ++cur_id;
    }

src/graph.hpp

@@ -95,6 +95,7 @@ public:
    NodeId matched_neighbor {invalid_node_id};
    NodeId ear_or_root_neighbor {invalid_node_id};
    NodeId root_of_ear_component {invalid_node_id};
+   bool scanned;
 
 private:
    // This allows each Graph to access private members of this class,