SCREEN_SELECT

       Allow a user to make an interactive screen selection from a list

       This procedure determines whether to use the dumb terminal version,
       or the widget version by examining the !D.NAME system variable.

       screen_select, selections, iselected, comments, command_line, only_one

       selections - string array giving list of items that can be
               selected.

       comments - comments which can be requested for each item in
               array selections.  It can be:
                       string array - same length as array selections.
                       null string - no comments available
                       scalar string - name of a procedure which will
                               return comments.  It will take selections
                               as its first argument and return comments
                               as its second argument.
       command_line - optional command line to be placed at the bottom
               of the screen.  It is usually used to specify what the
               user is selecting.
       only_one - integer flag. If set to 1 then the user can only select
               one item.  The routine returns immediately after the first
               selection is made.

       iselected - list of indices in selections giving the selected
               items.

       COUNT - Integer scalar giving the number of selections made

       The obsolete system variable !err is set to the number of selections

       The actual processing is farmed out to different procedures depending
       on the terminal type.
       Widget Terminal   ==>  SELECT_W.PRO
       VT100 Terminal  ==>    SELECT_O.PRO

       Written by M. Greason, STX, May 1990.
       Added widget support    W. Landsman           January, 1992
       Remove X window but no widget option         November, 1994
       Converted to IDL V5.0   W. Landsman   September 1997
       Added COUNT keyword, deprecate !ERR   W. Landsman   March 2000

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