Revert "Fixes #230"

This reverts commit a359ca6d0b7f0e2fc96782b5267a8af2536d9b1d.

h/js/plugin/threading.coffee

@@ -21,10 +21,7 @@ class Annotator.Plugin.Threading extends Annotator.Plugin
     # Attach the thread to its parent, if any.
     if annotation.references?.length
       prev = annotation.references[annotation.references.length-1]
-      if annotation.created?
-        @annotator.threading.getContainer(prev).addChild thread
-      else
-        @annotator.threading.getContainer(prev).addChildToPos thread, 0
+      @annotator.threading.getContainer(prev).addChild thread
 
     # Expose the thread to the annotation
     Object.defineProperty annotation, 'thread',

h/lib/jwz.js

@@ -73,12 +73,6 @@
         return top;
       }
 
-      function addChildToPos(child, pos) {
-        if(child.parent) child.parent.removeChild(child);
-        this.children.splice(pos,0,child);
-        child.parent = this;
-      }
-
       function addChild(child) {
         if(child.parent) child.parent.removeChild(child);
         this.children.push(child);
@@ -110,7 +104,6 @@
         getSpecificChild: getSpecificChild,
         threadParent: threadParent,
         addChild: addChild,
-        addChildToPos: addChildToPos,
         removeChild: removeChild,
         hasDescendant: hasDescendant
       }