Revision 194840

PR:
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Separate Position from BreakPoss and create Leaf and NonLeafPosition classes.
Move management of Trait to top level Area class and use HAshMap instead of List.
Generalize handling of Trait in XMLRenderer and AreaTreeBuilder.
Improve handling of word-space and inter-area inline spaces in BP-style layout
managers. Set border and padding traits on InlineParent areas.