D-Net

moving ACM importer to icm-iis-mainworkflows due to extending dependances with cermine, introducing performance tests

updating default job properties

removing 'import' directory creation and removal which was obsolete

checking whether trust level is empty before comparing to predefined threshold

introducing trust level threshold support when importing information space data

extending description

introducing shared citation ExtraData XML model in icm-iis-common, implementing citation importer in mapred_import workflow, implementing exporter module

supporting $UNDEFINED$ value in IMPORT_INFERENCE_PROVENANCE_BLACKLIST

fixing dirs creation: removing obsolete directories

#527 introducing ACM XML dump importer module importing bibliographic references for further citation-matching analysis