D-Net

#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

#1133 dropping useless workfing_dir creation for streaming nodes

#720 fixing document classification algorithm confidence level distribution, switching mainworkflows pom dependency to the fixed document classification snapshot

updating default job properties