+23Jul20=======================================================================
+1. fix Filtering so that it does less of what it was doing badly, thus
+ the perl interpreter to do more of the work. Which means you *should* be
+ able to define more or less any allowable operation for that type of
+ filter. Which is a complicated way of saying: you can now use brackets.
+2. Regex expressions now appear as readable text in sh/filter.
+3. Make the RBN status file JSON, rather than DD format. In future versions
+ it will also be VERSIONed to enable more features to be added
+ transparently.
+4. Add show/rbn command to allow sysops to see who is using rbn.