Import latest changes to the unordered containers. Includes:

Copyright update.
Switch back to the version where the sentinel points to itself.
Remove alternative versions of swap.
Workaround a borland bug or two.
More consistent use of class/swap/template.
Avoid a few warnings.
Add a no-throw swap to the allocator for exception testing.


[SVN r3793]

test/objects/exception.hpp

@@ -1,5 +1,5 @@
 
-// Copyright 2006 Daniel James.
+// Copyright 2006-2007 Daniel James.
 // 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)
 
@@ -661,6 +661,11 @@ namespace exception
             }
             return (std::numeric_limits<std::size_t>::max)();
         }
+
+        friend void swap(allocator<T>& x, allocator<T>& y)
+        {
+            std::swap(x.tag_, y.tag_);
+        }
     };
 
     // It's pretty much impossible to write a compliant swap when these