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How to Restart an Object

Right now SELF_COPY is only used in IntegerVar, ...

SELF_COPY is also used in the PrimArray classes, and in XuWordArray in
Smalltalk so that it has the same transmit/receive protocol as the C++
version (which is not SELF_COPY).

	A minor translation issue: How does one cause the translator to
	generate an empty COPY section (one with no instance variables)?

The class should define a class method "copyClass" (no actual code is necessary).