D-Net

fixing mapping for license vs accessright #3128, cleanup

getting rid of person entities

upgraded solr version to 6.6.0

some java8 refactorings, added more tests for the software entities mapping

integrated latest changes from dnet40

instead of excluding datasets from the deduplication process, we include only publications

implemented use of opt in/out rules for entity fields (#2557).
depending on specific solrj version (thus excluding cdh6.X versions)

codebase used to migrate to java8 the production system