Changed implementation of FlattenLens to no longer support extracting object elements #622
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If new columns are to be added from JSON object elements, this should now be done using a BasicLens above the FlattenLens. Instead, the FlattenLens now just adds one new column (name given in definition) that contains the flattened entries.
Also changed all existing test cases so that they conform to the new way of defining FlattenLenses.