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Colon: ad hoc delimiter in some action operators

In a small number of operators, a colon is used instead of other more normal delimiters and joins.

In some of the operators relating to composites, a colon is used where a dot-operator type of dot-join might be expected:

In the stream processing group of operators, Stream.eachLine(loopVar[:condition]){actions} uses a colon where a comma argument delimiter might normally be expected.