Release of probe firmware 4760/4765

• Changes to use USB sticks (in v3 probes) as little as possible by buffering results in memory. As a tradeoff for more expected stability, the probes lose recent, unreported measurement results (ie. the ones collected in the last 60-90 seconds).
• Unexpectedly terminated TCP connections caused SIGPIPE signals crashing the measurement the process
• Various stability and security fixes to the measurement code