D-Net

#1301 skipping transformation when input set to $UNDEFINED$ value

#1301 removing redundant schema parameter

#1301 introducing generic avro to json transformer

bugfix: adding missing start element

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

#1210 introducing generic PIG module filtering inferred data by confidence level

#1195 removing obsolete ports docreation and datasetid from hbase mapred import, removing references to those ports in workflow.xml files, updating transformer by removing filtering by datasetid due to decisions made in #1072

introducing repetetive ordering of citations by ordering them by citation rawText

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

simplifying schema related PIG parameters