cubicweb-conference #972770 allow user to take back submission [resolved]

if abstract is submitted, but not in review yet, a user should be able to bring it back to state 'draft' to modify it.

prioritynormal
typeenhancement
done in0.7.0
load0.100
load left0.000
closed by#c1a58e571197 [workflow] allow users to redraft submitted talk (closes #972770)