ZLIB a known compression method, with the identity 1.
help make "keygen" another member function of RSA_METHOD etc.
[Geoff Thorpe]
+ *) Change the ZLIB compression method to be stateful, and make it
+ available to TLS with the number defined in
+ draft-ietf-tls-compression-04.txt.
+ [Richard Levitte]
+
*) Add the ASN.1 structures and functions for CertificatePair, which
is defined as follows (according to X.509_4thEditionDraftV6.pdf):