Make streaming support in cms cleaner.

Note errors in various S/MIME functions if CMS_final() fails.

Add streaming support for enveloped data.

Generalise RecipientInfo and enveloped data handling so applications can
add their own key lookup routines as well as using the standard ones.

Fix signed data creation so versions are only corrected if structure is
being created.

examples. All RFC4134 examples can not be processed.

Update CHANGES.

consistent with other content types.

tests in RFC4134.

Initial support for CMS.

Add zlib compression BIO.

Add AES key wrap implementation.

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