D-Net

#1315 propagating confidenceLevel to DocumentToConceptIds. Updating PIG transformer script by introducing concept identifiers deduplication UDF function picking record with the highest confidence level, introducing unit and integration tests. Propagating changes in document to concepts exporter module.

removing obsolete test resources

Removing usage of working_dir from Java workflow node.

#1169 fixing duplicate context issue, introducing integration test proving implemented solution works properly

#1133 dropping useless workfing_dir creation for java nodes

#919 renaming DocumentToResearchInitiative to DocumentToConceptId and DocumentToResearchInitiatives to DocumentToConceptIds

#1019 introducing integration test

#919 introducing integration test input and output

#919 introducing integration test containing empty input and output

#913 renaming DocumentContentUrl#contentSize to DocumentContentUrl#contentSizeKB changing field type from int to long, importing content size from ObjectStoreFile#fileSizeKB, updating dnet-objectstore-rmi dependency from 1.0.0 to 2.0.1-SNAPSHOT