ref + respect alphabetical order

Author: sloriot

Convex_hull_3/include/CGAL/Convex_hull_hierarchy_3.h

@@ -205,7 +205,7 @@ struct Convex_hull_hierarchy_3{
       //If maxlevel is small, we simply go through all its vertices
       for(auto vh=++(vertices(sm).begin()); vh!=vertices(sm).end(); ++vh){
         vertex_descriptor v = *vh;
-        auto p = converter(get(vpm, get(to_base_maps[level], v)));
+        const auto& p = converter(get(vpm, get(to_base_maps[level], v)));
         if(csp(p_max, p, dir)==SMALLER){
           p_max=p;
           argmax=v;
@@ -231,7 +231,7 @@ struct Convex_hull_hierarchy_3{
       do{
         is_local_max=true;
         for(vertex_descriptor v: vertices_around_target(argmax ,csm)){
-          auto p = converter(get(vpm, get(cbase, v)));
+          const auto& p = converter(get(vpm, get(cbase, v)));
           if(csp(p_max, p, dir)==SMALLER){
             p_max = p;
             argmax = v;

Convex_hull_3/include/CGAL/extreme_point_3.h

@@ -110,7 +110,7 @@ extreme_point_3(const PointRange& r, const Direction &dir, const NamedParameters
   typename PointRange::const_iterator argmax=r.begin();
   auto p_max = converter(get(point_map, *argmax));
   for(typename PointRange::const_iterator it=++r.begin(); it!=r.end(); ++it){
-    auto p = converter(get(point_map, *it));
+    const auto& p = converter(get(point_map, *it));
     if(csp(p_max, p, dir)==SMALLER){
       p_max=p;
       argmax=it;
@@ -205,7 +205,7 @@ extreme_vertex_3(const Graph& g, const Direction &dir, const NamedParameters &np
   do{
     is_local_max=true;
     for(auto v: vertices_around_target(argmax, g)){
-      auto p = converter(get(point_map, v));
+      const auto& p = converter(get(point_map, v));
       if(csp(p_max, p, dir)==SMALLER){
         p_max = p;
         argmax = v;

Kernel_23/include/CGAL/Kernel/interface_macros.h

@@ -112,10 +112,10 @@ CGAL_Kernel_pred(Compare_power_distance_2,
                  compare_power_distance_2_object)
 CGAL_Kernel_pred(Compare_power_distance_3,
                  compare_power_distance_3_object)
-CGAL_Kernel_pred(Compare_signed_distance_to_line_2,
-                 compare_signed_distance_to_line_2_object)
 CGAL_Kernel_pred(Compare_projection_along_direction_3,
                  compare_projection_along_direction_3_object)
+CGAL_Kernel_pred(Compare_signed_distance_to_line_2,
+                 compare_signed_distance_to_line_2_object)
 CGAL_Kernel_pred(Compare_slope_2,
                  compare_slope_2_object)
 CGAL_Kernel_pred(Compare_slope_3,