from preamble:

"Change Set:		PointerExplorer
Date:			29 September 2004
Author:			avi

md: repackaged as a changeset.

A variant on the ObjectExlorer that works 'backwards': like the
ObjectExplorer, it shows a tree of objects, but expanding a node won't
show the objects which that node references, but rather the objects that
reference that node.  Its main use is to track down memory leaks: if you
want to know why a particular object is still alive, open a
PointerExplorer on it and drill down until you find the root object
that's referencing it.  For example, find all the references to the
symbol #zot with:

PointerExplorer new openExplorerFor: #zot

For the 'name' of the object, the PointerExplorer shows each object's
identityHash, to allow the user to identify when two similar objects are
identical and notice cycles."!
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