use c++17 fold expression

+ indicate official LASlib is supported

Documentation/doc/Documentation/Third_party.txt

@@ -248,9 +248,8 @@ imported target `CGAL::LASLIB_support` provided in
 \laslib information can be obtained from
 <a href="https://lastools.github.io/">https://lastools.github.io/</a> and
 <a href="https://rapidlasso.de/product-overview/">https://rapidlasso.de/product-overview/</a>.
-\laslib is usually distributed along with LAStools: for simplicity, \cgal
-provides <a href="https://github.com/CGAL/LAStools">a fork with a
-CMake based install procedure</a>.
+\laslib is usually distributed along with LAStools. Current versions of \laslib provide CMake support.
+BUILD_SHARED_LIBS needs to be set to true on windows to create a dynamic linked library.
 
 \subsection thirdpartyOpenCV OpenCV
 

Point_set_processing_3/include/CGAL/IO/write_las_points.h

@@ -134,15 +134,9 @@ namespace LAS {
     output_value (point, get(current.first, *it), current.second);
   }
 
-  template<typename Value, typename Tuple, std::size_t I>
-  void output_tuple(LASpoint& point, const Value& v, const Tuple& t, std::index_sequence<I>) {
-    output_value(point, std::get<I>(v), std::get<I>(t));
-  }
-
-  template<typename Value, typename Tuple, std::size_t I, std::size_t... Is>
-  void output_tuple(LASpoint& point, const Value& v, const Tuple& t, std::index_sequence<I, Is...>) {
-    output_value(point, std::get<I>(v), std::get<I>(t));
-    output_tuple(point, v, t, std::index_sequence<Is...>());
+  template<typename Value, typename Tuple, std::size_t... Is>
+  void output_tuple(LASpoint& point, const Value& v, const Tuple& t, std::index_sequence<Is...>) {
+    (output_value(point, std::get<Is>(v), std::get<Is>(t)), ...);
   }
 
   template <typename ForwardIterator,