Remove reference to prelude structures that are no longer required.  Explicitly generate result codes when the main read-eval-print loop exits.
Remove reference to prelude structures that are no longer required.  Explicitly
generate result codes when the main read-eval-print loop exits.


git-svn-id: 98787b36aaefbae4b30fa755be920954cd25e1e4@433 ae7d391e-3f74-4a2b-a0db-a8776840fd2a

mn200/polyml,dcjm/polyml,polyml/polyml,mn200/polyml,dcjm/polyml,dcjm/polyml,polyml/polyml,mn200/polyml,dcjm/polyml,polyml/polyml,polyml/polyml,mn200/polyml