[ENH] Add lines to hierarchy views

Thu Dec 5 22:34:25 UTC 2002

from preamble:

"Change Set:		linesInHierarchy
Date:			5 December 2002
Author:			Steven Swerling

Add a preference called showLinesInHierarchyViews. When true, feint
lines are drawn in hierarchy views to make it more clear how the
elements in the view are related."!
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