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move to c++11 std::chrono library

In #1005 (closed) I explain that boost::posix_time::microsec_clock::local_time() is a performance pig. The idea is to move to the C++11 std::chrono standard library:

  • check whether the std::chrono library is implemented on all supported platforms
  • find the first boost version which implements chrono to posix time conversion
  • move the internal stats library code to chrono and verify performance change (could win a few percent)
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