The new model is based on permssions, privileges and roles.
Most importantly it corrects the reverse membership that caused problems
in the previous implementation. You add permission to privileges and
privileges to roles, not the other way around (even though it works that
way behind the scenes).
A permission object is a combination of a simple group and an aci.
The linkage between the aci and the permission is the description of
the permission. This shows as the name/description of the aci.
ldap:///self and groups granting groups (v1-style) are not supported by
this model (it will be provided separately).
This makes the aci plugin internal only.
ticket 445
We used to return a list of dns that failed to be added. We now return
a list of tuples instead. The tuple looks like (dn, reason) where reason
is the exception that was returned.
Also made the label we use for failures to be singular instead of plural
since we now print them out individually instead of as comma-separated.
ticket 270
