(all_symmetric_algorithms): Deleted old aes alias
rijndael-cbc@lysator.liu.se. Added official serpent name
serpent256-cbc. The alias serpent-cbc@lysator.liu.se should be
removed at a later date.
(all_crypto_algorithms): Likewise.
(lookup_crypto): Likewise.

Rev: src/algorithms.c:1.36
Rev: src/algorithms.h:1.12