Log Message:
Update to 0.6.0:

Noteworthy changes in version 0.6.0 (2007-05-XX)
------------------------------------------------

* Dropped all internal random, cipher, digest libs and only use gcrypt
  for such tasks. The library should only provide functions dedicated
  to parsing and packet creation for the protocol.

* Adjust code for the new Libgcrypt interface.
  Now Libgcrypt >1.2.2 is required to build the code.

* This new version introduces an API change and thus incompatibilities
  to prior versions.

* Lots of cleanups all over the place. This also includes simplification
  for various code parts.

* Better support for larger files.

* Map the libgcrypt error directly and remove the
  invalid CDK_Gcry_Error type.

* Add more regression tests for the various code parts.

* We do not support ElGamal signatures any longer.

* Merged patches from the other opencdk branch which is
  currently used by GnuTLS.

* Provide user callback for the stream. As a sample
  implementation, socket callbacks are implemented
  and use in cdk_stream_sockopen().

* Drop most of the rfc1991 legacy format. This means
  we do not generate any rfc1991 data, but we still
  understand it. An exception is the packet header output.

* Removed gnulib interface for now because the lib
  is currently not in use.

* Interfaces changes relative to 0.5.x
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 functions:
 cdk_stream_tmp			CHANGED: is now cdk_stream_tmp_new
 cdk_stream_new_from_mem	CHANGED: new argument and return error code
 cdk_stream_control		CHANGED: is no available any longer
 cdk_stream_new_from_cbs	NEW
 cdk_stream_mmap_part		NEW
 cdk_keydb_new_from_file	NEW
 cdk_keydb_new_from_mem		NEW
 cdk_keydb_new_from_stream	NEW
 cdk_keydb_import		CHANGED: second argument removed.
 cdk_keydb_pk_cache_sigs	DELETED
 cdk_kbnode_write_to_mem_alloc	NEW
 cdk_lib_startup		NEW
 cdk_lib_shutdown		NEW
 cdk_handle_set_keyring		NEW
 cdk_handle_get_verify_result	NEW
 cdk_subpkt_find_next		NEW
 cdk_subpkt_find_nth		NEW
 cdk_set_progress_handler	DELETED
 cdk_userid_get_pref_array	DELETED
 cdk_pk_encrypt			CHANGED: last argument is now gcry_mpi_t
 cdk_pk_decrypt			CHANGED: last argument is now gcry_mpi_t
 cdk_pk_get_mpi			CHANGED: new argument nwritten.
 cdk_sk_get_mpi			CHANGED: new argument nwritten.
 cdk_pk_release			NEW
 cdk_sk_release			NEW
 cdk_pubkey_to_sexp		NEW
 cdk_seckey_to_sexp		NEW
 cdk_armor_encode_buffer	NEW
 cdk_keygen_set_mdc_feature	DELETED
 cdk_keygen_set_algo_info	CHANGED: new argument usage.
 cdk_seskey_new			DELETED
 cdk_seskey_free		DELETED
 cdk_dek_encode_pkcs1		CHANGED: not public any longer.
 cdk_dek_decode_pkcs1		CHANGED: not public any longer.
 cdk_stream_tell		CHANGED: return type is now off_t
 cdk_stream_seek		CHANGED: argument is now off_t
 cdk_pk_check_self_sig		NEW

 constants:
 CDK_No_Data			NEW
 CDK_CTL_TRUSTMODEL		DELETED
 CDK_CTL_FORCE_DIGEST		DELETED
 CDK_COMPRESS_BZIP2		NEW
 CDK_MD_SHA{256,384,512}	NEW
 CDK_MD_{TIGER, MD2}		DELETED
 CDK_CIPHER_{SAFER_SK128, DES_SK} DELETED
 CDK_CTL_COMPAT		  	  DELETED

 structures:
 cdk_md_hd_t			CHANGED: is now gcry_md_hd_t
 cdk_cipher_hd_t		CHANGED: is now gcry_cipher_hd_t
 cdk_sesskey_t			CHANGED: is now gcry_mpi_t