Fix: some AutoSegments where wrongly flagged as reduced.

* Bug: In Anabatic::AutoSegment::canReduce(), when looking at a fixed
    segment we were unconditionally flagging it as reduced if it was
    a "jumper", regardless of it's length.
      It was wrong, now also check for a length below the P-Pitch.
      This was introduced when implementing the channel routing.

anabatic/src/AutoSegment.cpp

@@ -1802,7 +1802,7 @@ namespace Anabatic {
     AutoContact* source = getAutoSource();
     AutoContact* target = getAutoTarget();
 
-    if (isFixed()) {
+    if (isFixed() and (length < getPPitch())) {
       if (isSpinTopOrBottom() and source->isTurn() and target->isTurn())
         return true;
       return false;