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This is a simple tweak to the existing in-process SSH jump host support, where instead of opening a direct-tcpip channel to the destination host, we open a session channel and run a process in it to make the connection to the destination. So, where the existing jump host support replaced a local proxy command along the lines of "plink %proxyhost -nc %host %port", this one replaces "plink %proxyhost run-some-command". Also added a corresponding option to use a subsystem to make the connection. (Someone could configure an SSH server to support specific subsystem names for particular destinations, or a general schema of subsystem names that include the destination address in some standard format.) To avoid overflowing the already-full Proxy config panel with an extra subtype selector, I've put these in as additional top-level proxy types, so that instead of just PROXY_SSH we now have three PROXY_SSH_foo.