Ensure the error stack is cleared after errors are processed.
Also handle NULL returns safely.
Makes the debug mode spew more data, though almost none of
the contexts is in reaction to network peer data.
I've come to the conclusion that copyright mostly just stands in the way
of software development. In my jurisdiction I cannot give up my own
copyright and 0BSD seems to be the closest thing to public domain.
The updated mail address, also used in my author/committer lines,
is shorter and looks nicer. People rarely interact anyway.
Reliability enhancement for Linux.
This feature was created for ponymap, however we don't care about an
extra syscall in most places. Doing it right even saves lines.
degesch has something like "stdio wpath cpath inet tty proc exec"
but given that it's user-extensible and very annoying for users to
have it crash, I'm leaving it unrestricted for now.
Involves some rewrites to fit the new APIs.
SNI has been implemented Mostly just because we can, I don't think it's
widely in use and kike doesn't support this feature of the protocol either.
Allow specifying a custom certificate bundle (can be handy for
connecting to servers with a self-signed certificate).
Enabled certificate verification by default.
Renamed the "ssl_use" to just "ssl".
