RNAProduct: objects now hold type code rather than type ID
More useful, for instance for the upcoming implementation of Transcript::get_all_RNAProducts() with type filtering. Drawback: must do a join between rnaproduct and rnaproduct_type on all queries so that RNAProductAdaptor has got something to put in this field. Complete with relevant updates to RNAProductTypeMapper and its tests.
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