Add better support for error on receipt of unimplemented #23
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Motivation:
When we receive the SSH_MSG_UNIMPLEMENTED it's because we sent a message
the remote peer does not understand. We can't do much about this, but we
can construct an error that is clearer about what exactly happened
instead of using a generic protocol error.
Modifications:
Result:
Users will be less confused if this happens.
Resolves #21.