shifting a unionSet or DataReferenceImpl

[Bill Hibbard]

> Most of the field variables associated with unionSet are package
> protected so it's not simple to play with ranges.

I wasn't suggesting direct access to and modification
of internal variables of your UnionSet and the Sets in
its union. I was suggesting constructing a new UnionSet
and new copies of the Sets in the union, but modifying
the longitudes in the calls to the constructors for
the Sets in the union.

Good luck,
Bill

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