code: public void unassignGroupInDb(final JAASSystem _jaasSystem,
                                    final Group _group)
          throws EFapsException
      {
          unassignFromUserObjectInDb(CIAdminUser.Person2Group.getType(), _jaasSystem, _group);
      }
docs: The given group is unassigned for the given JAAS system from this person.
  
  @param _jaasSystem JAAS system for which the role is assigned
  @param _group group to unassign
  @throws EFapsException on error
  @see AbstractUserObject#unassignFromUserObjectInDb