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