[boost] [info] More Boost.org copyrights removed

Here's the final batch of file to have their boost.org copyrights removed, as before: If your name has been added when it should not have been, or if your name should have been added to the copyright declarations, but has not been, then please speak up now. Here are the files affected: boost/cast.hpp: Kevlin Henney and Dave Abrahams boost/checked_delete.hpp: Peter Dimov Daniel Frey Howard Hinnant boost/integer_fwd.hpp: Dave Abrahams. boost/math_fwd.hpp: Dave Abrahams. boost/smart_ptr.hpp: Peter Dimov libs/conversion/cast_test.cpp: Beman Dawes, Dave Abrahams. libs/utility/noncopyable_test.cpp: Beman Dawes. Thanks, John Maddock