D-Net

#118 introducing madis based communities generation for website usage analysis

#919 renaming DocumentToResearchInitiative to DocumentToConceptId and DocumentToResearchInitiatives to DocumentToConceptIds

#1022 removing ExtractedDocumentMetadata envelope: origin info is not required

#1022 introducing ExtractedDocumentMetadata envelope required for collapsing PMC metadata records

removing unused import statement

fixing indent

#919 introducing Concept schema and importer module producing avro datastore based on XML profile

#686 introducing ExtractedDocumentMetadataEnvelope schema definition

#577 introducing citation envelope

#1017 introducing PMC extracted metadata schema