fix regression in toplevel printing of lazy values

(fix from Leo White)

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15599 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
update Changes

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15600 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
testsuite/lib-hashtbl: use LICENSE rather than /usr/share/dict/words to avoid excessive test time

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15601 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6640: add 'precious' as a builtin-useful tag

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@15605 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02