cubicweb-datacat #10772072 have RDF export usable from CKAN [validation pending]

Some data are exported as a resource whereas a literal is expected. See recommendation from DCAT-AP 1.1 and requirements on CKAN side.

done in0.6.0
load left0.000
closed by<not specified>
patchExport concept schemes using dcterms instead of dc [applied]Export cwuri instead of absolute_url for concepts [applied]