of the EVP routines to public key algorithms.

Add the corresponding AES parts while I'm at it.
make update

deviates from the "standard" 64 bits of feedback that all other
algorithms are using.  Therefore, let's redo certain EVP macros to
accept different amounts of feedback bits for these modes.

Also, change e_aes.c to provide all usually available modes for AES.
CTR isn't included yet.

OpenBSD /dev/crypto (this will be revamped later when the appropriate machinery
is available).

Change the EVP_somecipher() and EVP_somedigest()
functions to return constant EVP_MD and EVP_CIPHER
pointers.

Update docs.

Documentation correction.

Declare ciphers in terms of macros. This reduces
the amount of code and places each block cipher EVP
definition in a single file instead of being spread
over 4 files.