[Math] - Fix bug in bessel_jn for n == -1. - Add new test case. [DateTime] - Added missing config.hpp include for the wide characters support configuration macro. [Graph] - Changed to two_bit_color_map by default - Default color map to white, and fixed some warnings [Asio] - Add missing #include <iostream>. - Use a pipe if eventfd is not supported at runtime. Fixes #2683. - Ensure arguments to windows::overlapped_ptr::complete() are passed through to the completion handler. Fixes #2614. [Random] - Make validation a static member function. Fixes #2673 [Flyweight] - added missing std:: [Fusion] - fix wrong include
