Cleanup metrics fields and factory tests (cont)

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Register two additional fields in the metrics factory, which had verification tests in test_metric_fields.py but were not registered in the factory and rename and move very general programs out of metric_fields.py. Field verification is now done within the factory tests, StencilTests added for the generic functions in math_helpers.py.

additional changes:

• delete __init__.py from common/tests
• replace computation of input z_mc with field from serializer in tests.

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