2005-03-30 Moritz Schulte <moritz@g10code.com>

• libgcrypt.vers: Added: gcry_ac_io_init, gry_ac_io_init_va.

• gcrypt.h (gcry_ac_data_read_cb_t, gcry_ac_data_write_cb_t,

gcry_ac_io_mode_t, gcry_ac_io_type_t, gcry_ac_io_t): New types.
(gcry_ac_io_init_va): Declare function.
(gcry_ac_data_encode, gcry_ac_data_decode,
gcry_ac_data_encrypt_scheme, gcry_ac_data_decrypt_scheme,
gcry_ac_data_sign_scheme, gcry_ac_data_verify_scheme): Use
gcry_ac_io_type_t objects instead of memory strings directly.