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Teuchos: fix typing of TwoDArray::operator[]

James Willenbring requested to merge ibaned:twodarray-operator-bracket into develop

Created by: ibaned

This operator must be rarely used, because the return type doesn't match the type of the expression returned (it should be ArrayView<const T>, not const ArrayView<T>). I'm fixing this because I need this operator to unit test some YAML functionality I'm developing. (I can't use the operator(i, j) because there can be no commas in the argument to TEST_NOTHROW).

@trilinos/teuchos

This is a precursor to an upcoming PR

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