RT-ZGRAPH IMPROVEMENTS   --- 10/21/88
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Improvements
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1. Global variables which can be changed were changed to 
   instance variables of the flavors.

2. New menu item which can changes the fonts was added to STSTUS menu.
   It can change following fonts independently: Edge labels, vertex labes,
   and contents of the description pane.
   Whenever user changes the font of description pane to new one,
   new window is created with ':init-font new-font".

3. User can add the user-specified commands to *miscellaneous-command-menu*.
   The element which will be pushed to *miscellaneous-command-menu* take 
   two forms:
     ((string for MISC menu)
      :CHOICES choice-list
      {:DOCUMENTATION documentation-string})

     ((string for MISC menu)
      :READ prompt
      {:NUMBER}  ;; If position integer will be read from dialog box as input to function
                 ;; Dialog-box always returns string.    
      function-to-be-evaluated
      {:DOCUMENTATION documentation-string})

4. Moving vertices.
   Clcik MOUSE-L for choose the vertex to be moved then click MOUSE-R for new-position.
   Mouse-R was used for new position instead of MOUSE-L since MOUSE-L is already used
   for panning.

5. The code for deleting a graph was debugged.

6. The function "clean-up-windows" was created to remove the current graph and all the
   previously created graphs.
