Add a new property to the composer cs model and shuffle ingestion and export

[ddelpiano]

Acceptance criteria:

• cs.label should import skos:prefLabel
• cs.label should be exported in
• create a new property for the cs model, it can called shortName
• cs.shortName should ingest rdfs:label
• in the export, the column subject should be populated from cs.shortName (we will display the same data we have now, we are just moving this to a new property).
• display cs.shortName in the statement details always readonly, side by side with the population set.
• for KS that have never been exported the cs.shortName can stay empty, so we don't need to display it.
• on export, the shortName is filled with 'neuron type ' + population_set + ' ' + compr index (the incremental one).