use by the application.

* certificate.c (spki_principal_add_key): Initialize verifier
field.
(spki_principal_add_md5, spki_principal_add_sha1): Likewise.
(spki_5_tuple_by_subject): Moved function from reduce.c, and made
non-static.
(spki_acl_by_subject_first): New function.
(spki_acl_by_subject_next): New function.

Rev: src/spki/certificate.c:1.19
Rev: src/spki/certificate.h:1.18