+03Nov00=======================================================================
+1. allow - in filter strings
+2. store only the filter expression NOTE BENE: you will need to clear all
+your existing filters and re-enter them!!!!!!
+3. Added announce filtering
+4. Fixed problem with announce filtering on output to the node
02Nov00=======================================================================
1. updated filtering logic. You will need to RECREATE your filters (clear/spot
all, then start again) for testing.
+2. allow PC73 for DXNet
+3. added some help text for filtering and filtering spots in particular.
01Nov00=======================================================================
1. put PC11 field 2 check back to m for pc text.
2. improve 'simple' callsign checking