+07Jul20=======================================================================
+1. Fix show/cluster command to take into account the presence of skimmer nodes
+ which are a new category of thing which is neither a node nor a user.
+06Jul20=======================================================================
+1. Update console.pl (dx) to improve scrolling as keyboard speed.
+05Jul20=======================================================================
+1. Fix show/dxcc.
+17Jun20=======================================================================
+1. Change the Spot file reading mechanism back to the default of using 'tac'.
+08Jun20=======================================================================
+1. Fix show/mydx (lack of) filtering bug.
+2. Add qra locator to prefix_data.pl.
+3. Add 4 digit qra square for spotted callsign if show/dxgrid is enabled.
+4. Fix general filtering bug where erroneous input causes crashing.