User's capacity to leave a group

[cagabi]

Picking up from @pb66 comment in #37:

what I noticed was that all the working groups have me as a default user and admin, and that there is no way to delete me.

That is a tricky one:

• It makes sense that the one that creates the group becomes the administrator of the group
• You, as administrator, can add users to the group and set their role to Administrator
• You cannot delete yourself but other administrators can. This has been identified as a problem in #15
• In the case of allowing a user to leave a group with one click (instead of having to ask an administrator) we should check first that there are other administrators in the group otherwise the group would get locked

I think this is something that needs to be implemented, specially thinking on the new GDPR and ways of making users able to control their data

[beaylott]

Yes we need a super delete button!