Import C++11 branch

Import C++11 branch from:

https://github.com/mcostalba/Stockfish/tree/c++11

The version imported is teh last one as of today:
https://github.com/mcostalba/Stockfish/commit/6670e93e50a7a4e739ac2ac8b6026ffa3a12150a

Branch is fully equivalent with master but syzygy
tablebases that are missing (but will be added with
next commit).

bench: 8080602

src/search.h

@@ -95,7 +95,7 @@ struct SignalsType {
   bool stop, stopOnPonderhit, firstRootMove, failedLowAtRoot;
 };
 
-typedef std::auto_ptr<std::stack<StateInfo> > StateStackPtr;
+typedef std::unique_ptr<std::stack<StateInfo>> StateStackPtr;
 
 extern volatile SignalsType Signals;
 extern LimitsType Limits;