D-Net

#1212 updating classification test expected results after fixing typo: dccclasses->ddcclasses in taxonomies.db

#1212 updating null taxonomy test expected results after fixing typo: dccclasses->ddcclasses in taxonomies.db

#1212 fixing typo: dccclasses->ddcclasses in taxonomies.db

#1212 updating taxomonies database, introducing acm taxonomy classification, introducing acm classes support in exporter module, updating integration tests

#1257 dropping schema generation related hacks in streaming modules, switching to literal schema parameters

updating expected test outcome after confidence level normalization

updating expected test outcome after confidence level normalization

Removing usage of working_dir from Java workflow node.

#1133 dropping useless workfing_dir creation for java nodes

#1133 dropping useless workfing_dir creation for streaming nodes