Short Description: Drag SimObj Opt: Prevent multiple Account items selections.
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

Prevent (many) AccountGfxItems from being selected when doing a rubber-band
selection on the Accounting Workspace.  Only a single AccountGfxItems needs 
to be selected at a time, and the unnecessary (and incorrect) multiple 
Account Item selection ornamentation slows down multiple-SimObj Region drag 
operations.

This is working pretty well. There is still an unusual way of having multiple
AccountGfxItems selected -- but it generally won't happen and isn't actually
a problem at this point.  (Currently, we don't really DO anything with the
selected AccountGfxItem -- it is basically just a visual ornamentation).

--------------------------
QtUtils/AccountGfxItem.hpp
QtUtils/AccountGfxItem.cpp
--------------------------

Add setAcctItemSelected (bool) method, and "hide" the QGraphicsRectItem 
base class setSelected (bool) method (to the extent that that's possible 
-- that doesn't actually work if the method is called via a base-class 
pointer). (This is relevant because QGraphicsRectItem::setSelected (bool)
is NOT virtual, so can't be directly overridden).

 private:
   void setSelected (bool yes)  // hide QGraphicsItem method from public
      { QGraphicsRectItem::setSelected (yes); } 
 public:
   void setAcctItemSelected (bool yes);

The setAcctItemSelected (bool) method disables the "selectability" of the
item if it is being de-selected.

-----------------------------
QtUtils/AcctRowGfxItem.cpp
QtUtils/WorkspaceGfxScene.cpp
-----------------------------

Call the new method when attempting to select or deselect an Account 
graphics item.  (See above).

---