<p>I made a couple of simple changes; feel free to revert them if you like.  <code>execinfo.h</code> is no longer included in the <code>mlpack</code> namespace, <code>execinfo</code> is only linked against the <code>mlpack</code> target (since it's only used in <code>log.cpp</code> and not anywhere else), and I also provided a default <code>backtrace.hpp</code> file so that users don't get confused before it's configured.  (That file will be overwritten during the configuration process.)  If you think that's okay, then I think this issue is fixed.</p>

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