BibHarvest: cleanly add OpenAIRE compliancy
BibHarvest: cleanly add OpenAIRE compliancy

* Fully integrate OpenAIRE compliancy into BibHarvest
  without assuming a given set name, but just looking into metadata.

tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter