D-Net

#840 moving IdentifierMapping from importer to common package

#840 renaming DeduplicationMapping to more generic IdentifierMapping

#757 introducing doitooaid transformer processing DocumentMetadata datastore holding metadata imported from InformationSpace and creating datastore holding <doi,oaid> pairs which will be used by pmc ingestor for matching references identified by doi

null reference ids removed

updating default job.properties

removing memory related properties, fixing #757 should solve all memory related problems

#568 introducing citations grouping by sourceDocumentId, still to be adjusted for ingested pmc citations outcome which currently seems to hang up

#577 introducing UDF producing empty map, two transformers building common Citation datastore from citationmatching and pmc ingestion outcome. Both are required by collapser.

introducing importer/plaintext/skip_extracted transformer required for plaintext import caching

#354 removing obsolete transformers/export/person transformer along with tests