SP-179, BIS-21: Adding feature vector support.

...sd/openbis/dss/etl/dto/api/impl/FeatureVectorDataSet.java

...isd/openbis/dss/etl/dto/api/v2/IFeatureVectorDataSet.java

...bis/dss/etl/dto/api/v2/SimpleFeatureVectorDataConfig.java

...dss/etl/jython/ImagingDataSetRegistrationTransaction.java

...isd/openbis/dss/etl/jython/JythonPlateDatasetFactory.java

...l/jython/v2/IImagingDataSetRegistrationTransactionV2.java

...n/v2/ImagingDataSetRegistrationTransactionV2Delegate.java

...AggregatedFeatureVectorsTest-drop-box/data-set-handler.py

...s/AggregatedFeatureVectorsTest-drop-box/plugin.properties