Foci creation
    When Foci Mode
      is activated, Create tools are selected by default and displayed at
        the bottom of the Toolbar.
      
    
         
    
      - Loaded foci files are NOT automatically
          displayed. To turn Foci on before creating a new focus, toggle
          on Display Foci in the Features
                Toolbox Foci tab. Display of specific foci
          can be selected in Foci:
            Selection.  
      - There are 3 ways to identify a location
          for focus creation:
      
        - Left click on the surface or volume.
            The coordinates for the location selected will populate the
            Create Focus box.
 
- Click the New button and enter
            XYZ coordinates.
 
- Click on the Last ID
            button and the coordinates for the location last identified
            in View mode will populate the Create Focus
              box.
      - If a new foci file is not created, newly
          created foci will be added to a loaded foci file.
      - Use the Add/Edit buttons to
          select a Name, Color,
          and Class
          (optional) for the created focus.
          A Name must be created for each focus, the color may be set
          with the sliders, otherwise the default is black. The default
          for Name and Class is the name/class one last used or '???'.
          Creation of 2 or more foci with the same Name, Color, and
          Class is allowed.  
      - The Project to Surface toggle
          will project the focus at any location to the nearest location
          on the surface being viewed.
      - The finished focus will appear on the
          surface/volume and the new focus name and class will show up
          in the Features Toolbox Foci:Selection
          tab. 
