Revision 198599

-- Modified the PSLM constructor and mapping Maker to take an
AreaTreeHandler object.  The Maker also returns a PSLM object to allow
for future detachment of PSLM from increasingly ill-fitting
AbstractLayoutManager and/or LayoutManager.

-- Removed areaTreeModel instance variable from PSLM hopefully
to increase code comprehension (better clarifies that the
ATM is owned by the ATH.)