do not allow edge attribtues with same type id for trapi #222
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biothings/biothings_explorer#891
Previously, if a edge had mutliple TRAPI records, the last TRAPI record would decide the edge-attributes, which meant no duplicates (and no merging behavior).
With the SemmedDB sentences PR (#219), it was required in that situation to merge multiple (suporting publication) edge-attributes from the different records composing an edge.
Here, I have changed the behavior for all attributes (except the ones used in SemmedDB sentences) to a behavior where if multiple TRAPI records have edge attributes with the same attribute_type_id, only the first one will be taken.