Changes between 0.9.6 and 0.9.7 [xx XXX 2000]
+ *) Hide BN_CTX structure details in bn_lcl.h instead of publishing them
+ in <openssl/bn.h>. Also further increase BN_CTX_NUM to 24.
+ [Bodo Moeller]
+
+ *) Modify EVP_Digest*() routines so they now return values. Although the
+ internal software routines can never fail additional hardware versions
+ might.
+ [Steve Henson]
+
*) Clean up crypto/err/err.h and change some error codes to avoid conflicts:
Previously ERR_R_FATAL was too small and coincided with ERR_LIB_PKCS7