+15Feb07=======================================================================
+1. allow convkeps.pl to parse NORAD keps files.
+22Jan07=======================================================================
+1. disable default propagation of PC9x sentences
+2. simplify PC17 handling
+16Jan07=======================================================================
+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.
+15Jan07=======================================================================