+22Jan06=======================================================================
+1. disable default propagation of PC9x sentences
+16Jan06=======================================================================
+1. back ported a change to PC16 handling so that a locally connected node's
+info clears out and generally overrides any residual PC16 info gathered from
+elsewhere.
+15Jan06=======================================================================
+1. added CTY-1701
+07Jan06=======================================================================
+1. use IO::Socket blocking where available and switch off or ignore all
+attempts to block.