We cannot create the local authority in authentication-procs, because acs_magic_objects isn't defined until acs-create.sql, and is referenced by a trigger on acs-objects.
fixing broken installation: changing service contract implementation id columns in the auth_authorities table to reference acs_objects instead of acs_sc_impls table as the latter table is created later
Support for external authentication: two new columns added to users table - username and authority. New object type authority with corresponding table auth_authorities. Bumping version number to 5.0d3
