D-Net

#955 fixing reference raw text generation for pretty printed NLM documents

#840 renaming DeduplicationMapping to more generic IdentifierMapping

#757 adding reducing phase for filtering out pmids by article type, mapping phase groups PmidMapping objects by pmid and at reducer phase duplicates will be filtered out

#757 introducing article type extraction along with unit test. Article type will be required for filtering out pmc duplicates and leaving only proper types

#757 fixing pmid and doi matching, fixing sourceDocumentId and destinationDocumentId generation

Stub of a solution to the task #576: Ingestion of metadata from EuropePMC.

Refactored code to use the XPathEvaluator.fromString method.

replacing "result" string with Type.result.name()

rename a field