Swing program from DECUS tape

I had to modify SWING when I went to 5.0-2. I also, some time ago, added a
'list' option (get a directory listing while in swing).
  This area contains the result, with the Fortran sources in a ZOO file to
conserve space.
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John Howells           |  "Science does not     | howells@pioneer.arc.nasa.gov
Sterling Software      |   remove the terror    | howells@krypton.arc.nasa.gov
Palo Alto, Ca.         |   of the Gods"         | howells%kry@ames-io.arpa