stdlib/buffer.mli: typo
stdlib/bytes.{ml,mli}: add a few functions
stdlib/string.{ml,mli}: move [blit] to module Bytes, deprecate [copy]


git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@14880 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02