1. Drop PC12s purporting to originate at nodes that do PC9x (suggestion from
Lee VE1CC).
2. Increase default dup age for announces from 5 -> 18 hours.
+3. add CTY 2009 cty.dat data.
+4. Stop downgrading and sending CHAT messages on PC12 groups as it appears
+that this is yet another "standard" that isn't universally understood.
23Oct10=======================================================================
1. add dbexport command to allow the export of ak1a style databases to a
file.