apart from its standard files data unit input (further filesDU), it also supports metadata input (rdf data unit, called "metaDU"). Such metadata will consume output from E-distributionMetadata DPU.
data contained in "metaDPU" should be merged with metadata attached to the entry within filesDU. In case of conflict, "metaDPU" has preference (as this metadata was inputted manually). Knap, Tomáš may help by properly matching metadata outputted from e-distributionMetadata and metadata fields on Resource object.
Merged metadata should be loaded to CKAN. The L-filesToCkan DPU is already loading certain metadata to CKAN, so it should be just extended to load enriched and merge metadata
Adjust L-filesToCKAN DPU:
(cloned from OpenDataNode/ODN-UV-Plugins#2)