Fix the format of FieldArrayHandle
Clean up the implementation of FieldArrayHandleImplicit and write a test.

We never had a test for using an ArrayHandleImplicit with the ConceptMap.
Clean up the implementation of FieldArrayHandleConstant and write a test.

We never had a test for using an ArrayHandleConstant with the ConceptMap.
Clean up the implementation of FieldArrayHandleCounting and write a test.

We never had a test for using an ArrayHandleCounting with the ConceptMap
Clean up the implementation of FieldArrayHandlePermutation and write a test.

We never had a test for using an ArrayHandlePermutation with the ConceptMap
Clean up the implementation of FieldArrayHandleTransform and write a test.

We never had a test for using an ArrayHandleTransform with the ConceptMap