B{Abstract,Datagram,Secure}Socket:
- Add functionality to listen for and accept new connections, thus allowing
one to use the socket classes for server functionality as well.
BSecureSocket:
- Adjust to take into account differences between how SSL needs to be called
when accepting an incoming connection vs initiating an outbound one.
The handshake on the accepted connection stills fails for unknown reasons
at the moment though.
Note that these changes break the ABI, and thus any packages making use of
them directly will need a rebuild.
* Each class has a Socket() method to retrieve the underlaying file descriptor
to be able to do the more advanced stuff, if necessary.
* A server socket is yet missing, but the rest is pretty much covered.
