Move hash detail headers out of boost/functional/detail.

[SVN r49661]

hash/doc/changes.qbk

@@ -69,5 +69,9 @@
 
 * Changed the warnings in the deprecated headers from 1.34.0 to errors. These
   will be removed in a future version of Boost.
+* Moved detail headers out of `boost/functional/detail`, since they are part of
+  functional/hash, not functional. `boost/functional/detail/container_fwd.hpp`
+  has been moved to `boost/detail/container_fwd.hpp` as it's used outside of
+  this library, the others have been moved to `boost/functional/hash/detail`.
 
 [endsect]

hash/test/container_fwd_test.cpp

@@ -3,7 +3,7 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-#include <boost/functional/detail/container_fwd.hpp>
+#include <boost/detail/container_fwd.hpp>
 
 #if BOOST_WORKAROUND(__GNUC__, < 3) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
 template <class charT, class Allocator>