Short Description: Qt4 Accounting View: Account QGraphicsItem Optimization
Bug Number: n/a
Release notes (y/n): no, not yet.
For Release Nums: 6.1

Cache the AccountGfxItem's computed QPainterPath 'shape'.

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QtUtils/AccountGfxItem.hpp
QtUtils/AccountGfxItem.cpp
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Maintain a computed copy of the QPainterPath 'shape', used both for drawing
the background and for the QGraphicsItem::shape() virtual method (used for 
Qt's collision detection and hit tests). 

New data member:
  mutable QPainterPath _shapePath;

New private method:
  void computeShapePath() const; // computes 'mutable' QPainterPath field.

Note that this new method is 'const' so that it can be called from our 
reimplementation of QGraphicsItem::shape() const.  In fact, computeShapePath()
is called only the first time the AccountGfxItem becomes visible (actually
drawn).

ALSO: Minor tweak: Use a little more horizontal space for the label in
Diversion Account items.  (0.7 changed to 0.8):

 const double typeSpecificMidWidth = 
   (acctTypeId == DIVERSION_ACCOUNT_ID) ? (0.8 * width()) : double (width());

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