Added updated usage scenario for okular for Ubuntu 22.04

Open Arne Tarara requested to merge arnetr/feep:arnetr-master-patch-80834 into master
  • Filename to write moved to /tmp folder to not assume present working directory of "messpc"
  • Clicks working with slightly different interface positions of either new Ubuntu, new Okular or just our display scaling. Hopefully portable
  • Extra clicks added to enter fullscreeen mode with new Ubuntu 22.04 popunder open behaviour

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