Log Message:
etherape: update to 0.9.20

                            Changelog for EtherApe

  Overview of changes in EtherApe 0.9.20 (Sunday, May 16, 2021):

   Link fading now follows the averaging timer, giving a better feel of packet
   flow.
   Improved xml output. Now contains also links and global protocol statistics.
   Several preferences were removed or merged in a general tidying.
   Preference upgrade is automatic, but if EtherApe detects obsolete parameters
   the user will be asked to review and confirm the new settings.

   Compatibility Warnings:
     * the link-level xml element is now called 'link-id', instead of simply
       'link' as in the past releases. 'link' xml elements now refer to
       node-to-node statistics.
     * removed node-link ratio preference.
     * merged link protocol and traffic timeout preferences.
     * merged node protocol and traffic timeout preferences.

   Changes summary:
     * fix for ticket #100, thanks to Salam for reporting it.
     * diagram refresh command, thanks to Ronald W. Henderson
     * patch to remove artifact when resizing, thanks to Ronald W. Henderson
     * reorder keyboard shortcuts, thanks to Ronald W. Henderson
     * sort by port on protocol windows, thanks to Ronald W. Henderson
     * xml output now containes also link and global protocols statistics.
     * link fades with averaging times
     * node-link ratio slider removed, ratio always fixed at 1 (links sizes are \ 
aligned
       with nodes)
     * improve statistics repeatability esp. when setting max-delay=0 (useful \ 
for tests
       or just to calcolate quickly statistics of a dump file).
     * new no-display mode (command line only), disables diagram updates (again, \ 
mostly
       for testing).
     * merged link protocol and traffic timeouts.