SSL/TLS session IDs in a server. According to RFC2246, the session ID is an
arbitrary value chosen by the server. It can be useful to have some control
over this "arbitrary value" so as to choose it in ways that can aid in
things like external session caching and balancing (eg. clustering). The
default session ID generation is to fill the ID with random data.

The callback used by default is built in to ssl_sess.c, but registering a
callback in an SSL_CTX or in a particular SSL overrides this. BTW: SSL
callbacks will override SSL_CTX callbacks, and a new SSL structure inherits
any callback set in its 'parent' SSL_CTX. The header comments describe how
this mechanism ticks, and source code comments describe (hopefully) why it
ticks the way it does.

Man pages are on the way ...

[NB: Lutz was also hacking away and helping me to figure out how best to do
this.]

form '#if defined(...) || defined(...) || ...' and '#if !defined(...)
&& !defined(...) && ...'.  This also avoids the growing number of
special cases it was previously handling (some of them wrongly).

example) are declared with some extra linkage information.  This
generates a warning when using the function name as a value to a
regular function pointer with the "correct" definition of the
function.  Therefore, use a macro to cast the appropriate function on
VMS.

strings.h according to X/Open.

was made in a certain sequence.  This change restores the earlier
"chain of command".

callbacks, and their prototypes were consistent as they were. These casts
need reversing.

Also, I personally find line breaks during parameter lists (ie a line
ending in a comma) easier to read at a glance than line breaks at the end
of a function call and before a dereference on the return value (ie a line
ending in a closed-bracket followed by a line starting with "->").

OCSP_CRLID_new and OCSP_crlID_new clash on case-insensitive systems.

get a chance to be defined.
Make a batter file name translator (uhm, no, that's not the finished
variant :-)).

get a chance to be defined.

correctly defined.

lots of silly warnings from the compiler.

get a chance to be defined.

variants of stdio.h that define NULL in such a way that it's "unsafe"
to use for function pointer casting.

missed any.

This compiles and runs on Linux, and external applications have no
problems with it.  The definite test will be to build this on VMS.

Mention BN_[pseudo_]rand with top=-1 in CHANGES.

It's still inconsistent - probably better to undo the whole OPENSSL_NO_* thing.