The attributes displayed is now dependant upon their definition in
a Param. This enhances that, giving some level of control over how
the result is displayed to the user.
This also fixes displaying group membership, including failures of
adding/removing entries.
All tests pass now though there is still one problem. We need to
return the dn as well. Once that is fixed we just need to comment
out all the dn entries in the tests and they should once again
pass.
