Add missing copyright and licence notices

Add missing notices to various files to make clear they are distributable
under the boost licence.


[SVN r80527]

src/lockpool.cpp

@@ -1,5 +1,11 @@
 #include <boost/atomic.hpp>
 
+//  Copyright (c) 2011 Helge Bahmann
+//
+//  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)
+
 namespace boost {
 namespace atomics {
 namespace detail {