Suppress wrong error message in Katana::Session::_addMoveEvent().

* Bug: In Katana::Session::_addMoveEvent(), an error message is issued if
   the segment is not *already* in a Track. But, it is not the case for
   non-preferred Segment or reduced segment and it is valid. So suppress
   the message in those cases.

katana/src/Session.cpp

@@ -459,8 +459,10 @@ namespace Katana {
   void  Session::_addMoveEvent ( TrackElement* segment, Track* track, DbU::Unit axis )
   {
     if (not segment->getTrack()) {
-      cerr << Bug( " Katana::Session::addMoveEvent() : %s is not yet in a track."
-                 , getString(segment).c_str() ) << endl;
+      if (not segment->isNonPref() and not segment->isReduced()) {
+        cerr << Bug( " Katana::Session::addMoveEvent() : %s is not yet in a track."
+                   , getString(segment).c_str() ) << endl;
+      }
     } else {
       _addRemoveEvent( segment );
     }

katana/src/TrackSegment.cpp

@@ -1122,7 +1122,8 @@ namespace Katana {
     string s2 = " ["   + DbU::getValueString(_sourceU)
               +  ":"   + DbU::getValueString(_targetU) + "]"
               +  " "   + DbU::getValueString(_targetU-_sourceU)
-              +  " "   + getString(_dogLegLevel)
+              +  " "   + getString(_dogLegLevel) + " "
+              + ((isNonPref()      ) ? "P" : "-")
               + ((isRouted()       ) ? "R" : "-")
               + ((isSlackened()    ) ? "S" : "-")
               + ((_track           ) ? "T" : "-")