returning tha algorithm object, not just the name. Updated all
callers.
(lookup_mac): Likewise.
(lookup_compression): Likewise.
(lookup_hash): Likewise.
(vlist_algorithms): Made non-static.
(list_algorithms): Likewise.
(list_crypto_algorithms): Likewise.
(list_mac_algorithms): Likewise.
(list_compression_algorithms): Likewise.

Rev: src/algorithms.c:1.13
Rev: src/algorithms.h:1.5