simplify IPython.parallel connections Rolls back two-stage connection, putting complete connection info into the connection files. This makes it easier to use hand-crafted ssh tunnels, as all ports are read from the file, rather than from the reply to registration/connection requests. It is no longer possible to connect to the Controller without a connection file. Adding the serialization methods to the connection file also makes it harder for custom serialization to result in a mismatch in configuration between the various objects.