Since revision 458aaca328,
the `groups` args of the method `_notification_recipients`
is a list of tuple, and no longer a dict.
The code here has not been adapted to this change.
It is now.
opw-695300
There is now a single method easier to inherit to add specific behavior
for the display of access button as well as actions buttons. All addons
using this mechanism are updated accordingly.
stage_id is comptued and based on stage_ids
The default value should be put on stage_ids, not stage_id, it has the same
effect but avoids an unecessary chain update.
Denis Ledoux