implement remote kernel support through SSH #39
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This uses the --ssh option of the ipython console app to create the
necessary tunnels and create a new connection file with "-ssh"
added (because it may use different ports). Therefore, the REPL is
created before the driver.
The connection file naming convention of "emacs-*.ssh" is abandoned in
order to support arbitrary remote kernel connection files including "-"
characters (e.g. "kernel-36465-ssh.json"), so all non-whitespace
characters are matched by ExecuteHandler.
Since setting up SSH tunnels can take a while and only after that will
the modified connection file be available to the driver another sleep
must be used if SSH is invoked. The sleep delay is made customizable and
documented.
Fixes #11