#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
#1176 updating description
#1176 introducing side products removal in multiple_input_collapser by maintaining sideproducts_removal flag
#1133 dropping useless workfing_dir creation for pig nodes
#1022 introducing PMC extracted document metadata collapser removing duplicates before sending output to PMC citation ingestion module
#577 renaming origins to matched and ingested
updating job.properties
introducing missing record_collapser property in job.properties
memory-related properties set