Ingest-by-class : add data classes (e.g. Measurement, UnittedQuantity)

[cuddihyge]

Add another param to ingest-by-class-template: list of data classes.
For each data class, add the class and ingest it's data properties as if it were part of the target class.
e.g. if a class has data property ---temp--->Measurement then ingest temp_value and temp_units columns.