Initial support for CMS.

Add zlib compression BIO.

Add AES key wrap implementation.

Generalize S/MIME MIME code to support CMS and/or PKCS7.

holder and its actual encoding never used.

Just as well because it's value looks like it was made up in the mists of
time...

Now there is a registered value for zlib compression (used in S/MIME
compressedData content type) use that instead.

type. Useful for many attributes which are single valued and can only
have one type.

to say educational commit. Reordering instructions doesn't improve
performance much, rather exhibits Power6 limitations.

Also remove obsolete and now misleading comments.

known to exist. It does not exist on AIX 4.3.3, AIX 5.1, SCO 5, or Cygwin"
and disabled it on banch of systems it's known to exists, such as FreeBSD,
Solaris, 64-bit HP-UX, MacOS X. Get it straight.

Submitted by: Guenter Knauf <eflash@gmx.net>

implementation. This is essentially informational commit.