This commit was manufactured by cvs2svn to create branch
'compiler_supported_error_messages'.

svn path=/branches/compiler_supported_error_messages/boost/boost/type_traits/; revision=13249
Added type_with_alignment class template to return a type with the given alignment,
with documentation and testcases.

svn path=/branches/compiler_supported_error_messages/boost/boost/type_traits/; revision=13336