[DX] adding error messages to {ResultSet,ActionsRegistry}.possible_actions Try to make it more accessible, when we first encountered these errors it it didn't made any sense to us.

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))