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When doing the experiments that led me to file issue #70551 I was off SWAN and found that I had no access to detailed docs on what syntax was permitted for *.rules files. Would make sense, I think, to include important usage information in JavaHelp format inside the GUI module itself, for easy reference incl. when offline.
Added rule language write-up as help set. More documentation is obviously needed.
Added tutorial link to Help->Tutorials. All help hooks should now be in place, although a lot more writing is still needed.