updated to dnet-openaire-data-protos:3.5.0-SNAPSHOT
added min distance algorithm, used to identify the connected components (dedup)
fetch only instancetype and hostedby from the instance attributes, adding url to external references
added configurable max number of rel/children to be expanded in each entity
Added dc:creator
Added oaf:identifiers to record sample.
cleanup & tests
revised tests
small refactor