code: protected void overwriteOldEntry(Entry newEntry) {
          assert (this.getBuffer().isEmpty());
          assert (newEntry.getBuffer().isEmpty());
          this.data.overwriteOldCluster(newEntry.data);
          newEntry.setParentEntry(this.parentEntry);
          if (newEntry.getChild()!=null)
          for (Entry e : newEntry.getChild().getEntries())
          	e.setParentEntry(this);
          //this.setParentEntry(newEntry.getParentEntry());
          this.child=newEntry.child;
      }
docs: Overwrites the LS, SS and weightedN in the data cluster of this
  <code>Entry</code> to the values of the data cluster in the given
  <code>Entry</code>, but adds N and classCount of the cluster in the given
  Entry to the data cluster in this one. This function is useful when the
  weight of an entry becomes to small, and we want to forget the
  information of the old points.
  @param newEntry The cluster that should overwrite the information.