Add batch methods for traits

[denisrosset]

For example in RemoveableSearchableOps:

   final def --=(coll: Nextable with Countable with PointableKey[K]): lhs.type = {
     @tailrec def rec(p: Ptr[coll.Tag]): Unit = p.asInstanceOf[Ptr[coll.Tag]] match {
       case VPtr(vp) =>
       lhs.remove(vp.key)
       rec(vp.next)
       case _ =>
     }
     rec(coll.ptr)
     lhs
   }