Open Object Dialog, Data Object: Dup Slots; Shortcuts on Copy/Paste Slots
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 6.8

(1) Shortcuts added to Copy Slots / Paste Slots operations.

   (a) Copy Slots .. Ctrl+C
   (b) Paste Slots .. Ctrl+V .. (enabled only on Data Objects).

   There were a few technical complications with implementing these 
   operations.  Previously, the conditional enabledness of these operations 
   were being analyzed and applied only on the "About To Show" signals of 
   their containing menus (Menubar Slot >>, and Slot List treeview).  
   When shortcuts are present, that's "too late".  There is now a timer-
   based mechanism to do so soon after the selection within the Slot list 
   changes.  ALSO, these shortcuts didn't work when the Slot List lost 
   keyboard input focus -- though I wasn't able to understand why that 
   was even relevant, as the QActions were defined and deployed (as menu 
   items) at the dialog level.  I implemented a hopefully sufficient 
   workaround to prevent a particular specific widget focus change from 
   occurring as a result of the Past Slots operation.

(2) A new "Duplicate Slots" was added to both the Open Object Dialog's 
   "Slot" menu and slot list context menu.  (This appears only in the 
   Open Object Dialog for Data Objects).  It creates copies of the one 
   or more selected slots, right on the same object, with slightly 
   different names: having an appended unique number.

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