message: Added the method skeltons for filters. Implementaion to follow
diff: @@ -578,6 +578,26 @@ DataFrame<TS, HETERO>::get_view_by_loc (Index2D<int> range) {
  throw BadRange (buffer);
  }
  +// ----------------------------------------------------------------------------
  +
  +template<typename TS, typename HETERO>
  +template<typename ... types>
  +DataFrame<TS, HETERO>
  +DataFrame<TS, HETERO>::get_data_by_filter (types ... args) const {
  +
  + throw NotImplemented("get_data_by_filter() is not implemented yet");
  +}
  +
  +// ----------------------------------------------------------------------------
  +
  +template<typename TS, typename HETERO>
  +template<typename ... types>
  +DataFrameView<TS>
  +DataFrame<TS, HETERO>::get_view_by_filter (types ... args) const {
  +
  + throw NotImplemented("get_view_by_filter() is not implemented yet");
  +}
  +
  } // namespace hmdf
  // ----------------------------------------------------------------------------
  