code: public final void remove(FeatureProvider featurable)
      {
          toDelete.add(featurable.getFeature(Identifiable.class).getId());
          willDelete = true;
      }
docs: Remove a featurable from the remove list. Will be removed at the beginning of {@link #update(double)} call.
  If this function is called during {@link #update(double)}, it will be delayed to next {@link #update(double)}
  call.
  
  @param featurable The featurable to remove.