Estimate Request: User ordering of Plot Pages in the Plot Dialog Plot 
 Page Selection Panel.

Project notes:
 http://cadswes2.colorado.edu/~philw/2009/PlotPageSelPanelOrdering/

See image of the currently implemented panel:
 http://cadswes2.colorado.edu/~philw/2008/PlotPageSelPanel/

The order of Plot Pages in the Plot Dialog Plot Page Selection Panel is 
the order of Plot Pages in the Output Manager which lists also other 
types of Output Devices.  It would be simplest to define a user-editable
order of all Output Devices (including Plot Pages) within the Output 
Manager.

Technical note: The order of output devices is represented by the order
of items in a cwDlist (double-linked list) in Sim/cwOutputDeviceMgr:
 cwDlist<cwOutputDevice*> _devices;

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Design proposal:
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(1) In the Output Manager output device list, an initial column will be
 added showing the ordinal number of the list items.  (To keep the column
 narrow, the column header label for that column will be short: "Ord").

(2) Ordering controls would be added to the Output Manager below the 
 Output Device list:
    o  Icon Button: Up Arrow   (Blue Bulbous)
    o  Icon Button: Down Arrow (Blue Bulbous)
    o  Button: Set Order

(3) The ordering arrows will be enabled only when the list's first column
 is selected.  Clicking either button will move the single or multiple 
 selected items up or down by one position.  (Note that this list already 
 supports multiple selection).  The arrows will be disabled also when the 
 first or last row item is selected (respectively for the Up and Down 
 arrow buttons).  It will be reasonable to operate the Up and Down arrows 
 in rapid succession.

(4) The "Set Order" button will be enabled only when some other 
 column (other than the first column) is selected.  Clicking this button 
 will show a confirmation dialog box indicating that the previously defined
 custom order will be changed.  If the user continues, the custom order 
 will assigned from the current sort order, and the first column becomes 
 the selected column (resulting in enabling the Up and Down buttons).

(5) The custom order will be internally represented by the existing list
 in Sim/cwOutputDeviceMgr.

(6) There will be an easy way to show the Output Manager from the Plot 
 Dialogs, possibly from a new "Utilities" menu.

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Development tasks:
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(1) Sim/cwOutputDeviceMgr: Add methods to move a specified subset of 
 Output Devices up or down in the list.  

(2) Add a callback type for changes in the Output Device list order, 
 triggered from the new Sim/cwOutputDeviceMgr methods.

(3) Output Manager and Plot Dialogs: respond to the callback by refreshing
 Sim/cwOutputDeviceMgr's Output Device list, preserving the current item 
 selection.

(4) Output Manager Dialog: Add "Ord" column.  Add and implement widgets 
 for the sorting controls.

(5) Plot Dialogs: Add a control (probably a menu item) to show the Output
 Manager.

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Development estimate: 2 days
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