from preamble:

"Change Set:		UsableSiblingInstanceFix-nk
Date:			11 October 2003
Author:			Ned Konz

Morph>>usableSiblingInstance was always adding the created sibling to
the World, even though many of its callers would turn around and
immediately add the result to other morphs or delete them from the
World.

This change set makes #usableSiblingInstance not add the newly created
Morph to the World.

This makes several uses of #usableSiblingInstance more bug-free and
efficient.

"!
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