Prio 3: Optris-IP-640 Memory leackage

[tsiapkinis]

When running multilog with the Optirs-IP-640 thermal camera, more QThreads are created over time. This leads to an excessive memory usage (>20GB after ~2 hours of measurements). Check why the device is creating more threads.
This also leads to an issue where multilog does not terminate properly. All Qthreads have to be killed manually to terminate multilog.

[tsiapkinis]

This still happens on the Linux PC. On Windows I have not encountered it