Short Description: Added: ArrowHeadGfxItem, for Supply graphics items
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 6.1

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QtUtils/ArrowHeadGfxItem.cpp  -- NEW
QtUtils/ArrowHeadGfxItem.hpp  -- NEW
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class ArrowHeadGfxItem: public QGraphicsPolygonItem

An arrow head used initially for Supply items (lines) in the new
Qt4-based Accounting View.

The arrow head is configured with two points:

 (1) a "Head" point.
 (2) a "Tail Reference" point which is used only to define the direction 
     from which the arrow points.  The distance between the "Head" and 
     "Tail Reference" points is not relevant, but must be non-zero.

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