Added a junction to add a single road segment from multiple junction segments.

Improved the update and clean references functions.
When possible, use always the spline geometry.

include/opendrive_road.h

@@ -29,7 +29,7 @@ class COpendriveRoad
     void free(void);
     void link_segments(OpenDRIVE &open_drive);
     void link_neighbors(OpenDRIVE &open_drive);
-    void add_neighbors(const COpendriveRoadSegment *segment,segment_up_ref_t &new_segment_ref,node_up_ref_t &new_node_ref,lane_up_ref_t &new_lane_ref,link_up_ref_t &new_link_ref,TOpendriveWorldPose *start,TOpendriveWorldPose *end);
+    void add_segment(const COpendriveRoadSegment *segment,segment_up_ref_t &new_segment_ref,node_up_ref_t &new_node_ref,lane_up_ref_t &new_lane_ref,link_up_ref_t &new_link_ref);
     unsigned int add_node(COpendriveRoadNode *node);
     bool remove_node(COpendriveRoadNode *node);
     COpendriveRoadNode* get_node_at(TOpendriveWorldPose &pose);
@@ -41,9 +41,9 @@ class COpendriveRoad
     bool has_segment(COpendriveRoadSegment *segment);
     std::vector<unsigned int> update_path(node_up_ref_t &node_refs,std::vector<unsigned int> &path);
     void update_references(segment_up_ref_t &segment_refs,lane_up_ref_t &lane_refs,node_up_ref_t &node_refs);
-    void clean_references(segment_up_ref_t &segment_refs,lane_up_ref_t &lane_refs,node_up_ref_t &node_refs);
+    void clean_references(segment_up_ref_t &segment_refs,lane_up_ref_t &lane_refs,node_up_ref_t &node_refs,link_up_ref_t &new_link_ref);
     void reindex(void);
-    void prune(std::vector<unsigned int> &path_nodes,bool keep_first_left_lane=false);
+    void prune(std::vector<unsigned int> &path_nodes);
     unsigned int create_junction(const std::string &name,unsigned int start_segment,int start_lane_id,unsigned int end_segment,int end_lane_id);
   public:
     /**
@@ -402,7 +402,7 @@ class COpendriveRoad
      *
      * \return the sequence of road nodes describing the path in the new sub-road.
      */
-    std::vector<unsigned int> get_sub_road(std::vector<unsigned int> &path_nodes,TOpendriveWorldPose &end_pose,COpendriveRoad &new_road,bool keep_first_left_lane=false);
+    std::vector<unsigned int> get_sub_road(std::vector<unsigned int> &path_nodes,TOpendriveWorldPose &end_pose,COpendriveRoad &new_road);
     /**
      * \brief creates a sub-road with only the road elements within a distance to a given pose
      *