Short Description: Aggregation of Accounts in Items, Display Group Setting
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

(1) Aggregation of Account Items implemented, based on a toggle in Account
 Display Groups.  If enabled, all Accounts on a SimObj (or its Elements)
 which are part of such a Display Group are represented in a graphics item 
 for that Display Group.

(2) Special drawing for Aggregated Account Icons.  These consist of one or
 two representative Account Types of actual Account Instances in the Group.

(3) In AccountGfxItems LABELS, a background color contrasting with the
 user-configured text color is drawn in a rectangle behind the text.
 (The background rectangle is either white or black, depending on the
 brightness of the text color).  A more precise rectangle geometry is 
 computed than that which had been implemented for the SimObj label was
 devised, and that computation was applied also to the SimObj label.

(4) Double-clicking on an Account Graphics Item shows the Edit Account
 dialog for that item's Account (or the first Account of that item, if
 it represents more than one).

(5) In the Accounting View, physical links are hidden unless they are 
 enabled in the Display Group Editor "Preferences" menu.

------------------
AccountGfxItem.hpp
AccountGfxItem.cpp
------------------

Special drawing for Aggregated Account Icons.  The general QPainterPath
"shape" is also represented as two distinct QPainterPaths used specifically
for drawing.

  mutable QPainterPath _shapePath;  // full shape, returned by shape()
  mutable QPainterPath _shape1;     // drawn shape 1 
  mutable QPainterPath _shape2;     // drawn shape 2 (May be Null)

Added Account icon drawing helper functions:
  unsigned int firstAcctTypeId() const;
  unsigned int secondAcctTypeId() const;

  static void addStorShapeToPath (QPainterPath&, int w, int h, ...
  static void addPassShapeToPath (QPainterPath&, int w, int h, ...
  static void addDiveShapeToPath (QPainterPath&, int w, int h, ...
  static void addInstShapeToPath (QPainterPath&, int w, int h, ...

All notifications to the containing AcctRowGfxItem are now delivered 
through Qt signals.  The latter two were added:

 signals:
   void accountGfxItemDeleted (const AccountGfxItem*);
   void aggChangeDetected (const AccountGfxItem*); 
   void widthChangeDetected (const AccountGfxItem*); 

class AccountGfxItem::Label, enhancements for more precise background
rectangle drawn below the text.

 Added:
  QString _text;
  QBrush _bgBrush;  // Qt::NoBrush == no background

  void setLabelText (const QString&);
  QString labelText() const { return _text; }

  // For opaque background drawing. Use Qt::NoBrush for no background.
  void setBgBrush (const QBrush&, bool doUpdate=true);

  // virtual from QGraphicsItem
  virtual void paint (QPainter*, const QStyleOptionGraphicsItem*, QWidget*);

------------------
AcctRowGfxItem.hpp
AcctRowGfxItem.cpp
------------------

Aggregation of multiple Accounts within a single AccountGfxItem is 
implemented during building of the sequence AccountGfxItems.  As each
Account is considered, if there already exists an AccountGfxItem in 
which the Account should be aggregated, the Account is "added" to that
item instead of creating a new AccountGfxItem for that Account.  See 
changes in method:

  void AcctRowGfxItem::buildAccountItems (bool calledFromTimeout)

Since "aggregation" is a property of the highest-priority Account Display
Group to which each Account belows, it was very awkward to build the 
sequence of QGraphicItems BEFORE applying Display Group styles (as is sort 
of inherent in the overall legacy hyper-event-driven architecture).  I 
added a utility to return an Account's applicable Account Display Group.  

  // Display Group utilies
  static const AccountGroup* acctGroupForAccount (Account*);

Also, some preparation for supporting individual Account context menu 
operations on Aggregate Account Items.
  const QList<Account*>& getAccountListRefAtScenePos (const QPointF&) const;

... For notification from AccountGfxItems when they detect an Aggregation
Change.  The AggRowGfxItem responds by scheduling a rebuild operation:
   void aggChangeDetected (const AccountGfxItem*); // Qt slot

ALSO: in AcctRowGfxItem::mouseDoubleClickEvent (QGraphicsSceneMouseEvent*)
 ... Open the Edit Account Dialog for the item's (first) Account.

---------------------
SimObjGfxItem.hpp
SimObjGfxItem.cpp
WorkspaceGfxScene.cpp
WorkspaceGfxScene.hpp
---------------------

Changes in methods in preparation for additional context sub-menus for 
aggregated account items (representing more than one account):

Changes or added methods:
  const QList<Account*>& getAccountListRefAtScenePos (const QPointF&) const;
  void showAcctContextMenu (const QList<Account*>&, const QPoint& screenPos);

ALSO: Enhancements to the SimObjGfxItem to more precisely draw a background
 rectangle behind the label text.

----------------------
SimulationGfxScene.cpp
----------------------

In method: SimulationGfxScene::reconfigureLinkItems(), in the Accounting
View, hide Physical Links unless they are enabled in the Display Group
Editor "Preferences".

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