Robustness work on the image upload side.
Implement idle ("lack of progress") timeout on the server. Timeout work on the client-side too. Implement idle timeouts (not for SSL connections yet), fixup handling of over-all timeout. In particular, if we are reading from a pipe ('-') don't start timeout til we get some input from the pipe. Add option to put out progress dots on the client (cuz we are all about dots in imagezip/frisbee).
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