beginning work on new interface.
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before changing _load_ to a class method
before dealing with dummy level
before adding metadata
test_interface.py working. added metadata.py
renamed GlobalInterface to dataset
aggregation working
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test_dataset.py working.
before moving files and code to accomodate nc modules
before modifying spatial.vector.uid behavior
all tests working.
all tests working.
before adding geometry mask check to value return.