Short Description: Qt4 Accounting View Optimizations, esp. for model loading
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

Two major changes to address slowness of model load of Accounting models,
especially those using Supply Display Groups.

(1) Defer Supply creations until after the model load.
(2) Don't apply Supply Display Group styles on a single-supply basis.
 Instead, batch all such needed Supply style updates into a single operation.

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

Avoid unnecessary "updateSupplies" calls during model loading. (This is
for creating "missing" Supply and Transfer graphics items, and updating 
all such items' end-points).

See changes in methods:
  (1) void AccountGfxItem::schedUpdateSupplies()  // Transfer Items Too
  (2) void AccountGfxItem::updateSuppliesTimeout()

-----------------------------
QtUtils/WorkspaceGfxScene.hpp
QtUtils/WorkspaceGfxScene.cpp
-----------------------------

(1) Instead of applying Supply Display Group Styles to Supply and Transfer
Graphics Items as they are created, schedule a deferred style update, and 
do required updates at once (with a single access to the list of prioritized
Supply Display Groups).

  New data members:
   QTimer* _updateSupplyStylesTimer;
   bool _updateSupplyStyles_all;
   QSet<Supply*> _updateSupplyStyles_supplySet;

  New methods:
   void schedUpdateSupplyStyles (Supply*); // NULL means "ALL"
   void cancelUpdateSupplyStyles();
   void updateSupplyStyles (bool calledFromTimeout=false);
   void updateSupplyStylesTimeout();  // Qt slot

  Removed method:
   void setSupplyStyle (Supply*);

(2) Recoded these two methods. They used to search the entire QGrahpicsScene
for SupplyGfxItems or TransferGfxItems.  Now, instead, they find the 
SimObjGfxItem for the downstream SimObj, and call methods to drill down 
to the AccountGfxItems to search for the desired SupplyGfxItem or 
TransferGfxItem.

  SupplyGfxItem* getSupplyItem (Supply*) const
  TransferGfxItem* getTransferItem (Supply*) const

--------------------------
QtUtils/SimObjGfxItem.hpp
QtUtils/SimObjGfxItem.cpp
QtUtils/AcctRowGfxItem.hpp
QtUtils/AcctRowGfxItem.cpp
QtUtils/AccountGfxItem.hpp
QtUtils/AccountGfxItem.cpp
--------------------------

Added:
  SupplyGfxItem* getSupplyItem (Supply*) const;
  TransferGfxItem* getTransferItem (Supply*) const;

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