cubicweb-conference #1251156 Be able to import a conference via rdf [in-progress]

integrate datafeed cube in conference to be able to import a conference from another cubicweb-conference instance

prioritynormal
typeenhancement
done in0.15.0
load2.000
load left0.000
closed by<not specified>
patchuse datafeed to import other conferences (closes #1251156) [folded]