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The present Environment implementation presently supports legacy code 
of the form:

	Smalltalk at: aSymbol

but does not handle legacy code of the form:

	Smalltalk
		at: aSymbol
		ifAbsent: aBlock.

The attached changeset "fixes" this.  Note that legatees of this 
"fix" (and the first mentioned hack) are destined to disappoint if 
they do not in time adapt.  Each does a depth-search in the 
environment space to find a symbol.

Thus if code depending on this stuff had a user mistype aSymbol, but 
the typo existed in another NameSpace, blammo.  Likewise if a user 
has two or more namespaces with the same aSymbol.   The code would 
then be at the mercy of the depth-search to see which of the several 
aSymbols would get picked.

This changeset addresses the failing behavior of 
TestInterpreterPlugin under the new Environment regime.
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