* src/gcrypt-module.h (gcry_cipher_spec_t):  Move to ...
* src/cipher-proto.h (gcry_cipher_spec_t): here.  Merge with
cipher_extra_spec_t.  Add fields ALGO and FLAGS.  Set these fields in
all cipher modules.
* cipher/cipher.c: Change most code to replace the former module
system by a simpler system to gain information about the algorithms.
(disable_pubkey_algo): Simplified.  Not anymore thread-safe, though.
* cipher/md.c (_gcry_md_selftest): Use correct structure.  Not a real
problem because both define the same function as their first field.
* cipher/pubkey.c (_gcry_pk_selftest): Take care of the disabled flag.