docs: update doxygen configuration
Most notably:
- disable OPTIMIZE_OUTPUT_FOR_C, this is a C++ project
- enable sorting of brief descriptions of class members
- stop generating documentation for detail headers (not installed)
Change-Id: Ie0608888f53f9b38f0a6e09cf198981cd7474109
diff --git a/src/util/backports-optional.hpp b/src/util/backports-optional.hpp
index d00cb60..29862b1 100644
--- a/src/util/backports-optional.hpp
+++ b/src/util/backports-optional.hpp
@@ -1,5 +1,5 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
* Copyright (c) 2013-2017 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).