cubicweb-conference #978005 talk in_conf vocab is not the same for users and managers [resolved]

managers should be able to chose any conference (or else, the talk changes conference when modified).

prioritynormal
typebug
done in0.7.0
load0.100
load left0.000
closed by#4ffebfbcdde1 [forms] talk in_conf vocab must be different for users and managers (closes #978005)