[boost] LEAF has been refactored, it now has a much simplified error handling interface

LEAF is a C++11 error handling library for use in low-latency environments. I'm looking for a Boost Review Manager. Any one of you good people willing to volunteer? :) https://zajo.github.io/leaf/ Features: -Header-only, no dependencies. - No dynamic memory allocations. - Any error-related object of any movable type is efficiently delivered to the correct error handler. - Compatible with std::error_code, errno and any other error code type. - Support for multi-thread programming. - Can be used with or without exception handling.