D-Net

#1498 fixing unit test after adding position field in CitationEntry

#1498 introducing major citations related refactoring including new generic direct citation matching moved to processing phase, introduced position field in all citations schemas and updated collapser taking position into account when merging citations details coming from 3 variuos sources: fuzzy citationmatching, direct citationmatching, references metadata

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

#1257 renaming 'eu.dnetlib.iis.avro.map.output.value.class' property (which become obsolete) required by CollapserReducer to 'collapser.reducer.schema.class'.

#1257 dropping schema generation related hacks in all map-reduce modules, switching to literal schema parameters

Removing usage of working_dir from Java workflow node.

#1176 updating description

#1176 introducing side products removal in multiple_input_collapser by maintaining sideproducts_removal flag

#1133 dropping useless workfing_dir creation for java nodes

#1133 dropping useless workfing_dir creation for pig nodes