As an assurer I want to be able to delete an existing assurance for an user.
An assurance can be deleted if:
the assurance is issued by the user currently logged in, or
the currently logged in user have the assurance giving assurance for the assurance to be deleted (e.g. the assurance is "magyar" and the user have "assurer.assurer.magyar".
As an assurer I want to be able to delete an existing assurance for an user. An assurance can be deleted if: